How tennis betting odds work in Great Britain — and what they really cost

Updated October 2026

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Tennis sits in a small group of sports where almost everything that matters to a bettor — set format, surface, scheduling, tiebreak rules — is written down in plain language before a ball is struck, and the same fixture runs again on a different continent a week later. That makes the betting programme unusually deep: every bookmaker listed on the Gambling Commission’s public register offers the four Grand Slams, the ATP and WTA tours, and most ITF events, with prices set hours before first serve and refreshed throughout the match. The question this guide answers is what those prices actually mean: how a 1.91 about a server is built, why a market with two players and no draw still carries a margin, and what a reader on the British Gambling Commission register should check before staking a tenner on a first-round qualifier.

The figures below were last verified on 27 October 2026 and cross-checked against the Gambling Commission’s public register and each operator’s own terms page.

The tennis calendar and what it offers the punter

Tennis is unusual among the major betting sports in that the same handful of events dominate the year, and the rest of the calendar is dense rather than star-driven. The four Grand Slams — Australian Open on hard courts, French Open on red clay, Wimbledon on grass, US Open on hard courts — sit under the International Tennis Federation, the highest governing body in the sport. Wimbledon 2026 was played from 29 June to 12 July 2026, with Jannik Sinner lifting the men’s trophy and Linda Noskova taking the women’s. Around those four, the ATP and WTA tours run almost every week of the year across indoor hard, outdoor hard, clay and grass; the ITF circuit adds Challenger and lower-tier events; and team competitions — Davis Cup, Billie Jean King Cup, United Cup, the ATP Finals, the WTA Finals — slot in at the end of each season.

A match format is the first thing the betting programme reflects. Men play best of five sets only at the four Grand Slams; everywhere else on the ATP tour it is best of three. Women play best of three everywhere. A deciding set at six games all is settled by a tiebreak: first to seven points with a two-point lead, or by a match tiebreak in some events and certain tour formats — first to ten with a two-point lead. The set itself is usually won by the first player to take six games by two; at five games all it takes seven; at six all, the tiebreak decides. A game runs 0 (love), 15, 30, 40, and the first player to win four points with a two-point cushion takes it; at 40-40 the score is deuce and play continues until one player leads by two.

What that means for prices is that the betting programme is unusually uniform — there is no home-and-away league structure to learn, no promotion and relegation, no transfer window — and the variables are narrower than in football. Surface, recent form, head-to-head, scheduling and fitness decide most prices before the tournament begins; in-running, the scoreboard itself is the price driver. Because the match format is short and the calendar dense, every licensed British bookmaker offers outright markets on all four Slams, ATP and WTA event markets, match winner, set betting, over/under games, handicaps, and a deep in-play programme through the same app that handles pre-match prices.

The top ten British-licensed bookmakers for tennis

The shortlist below is drawn from the Gambling Commission’s public register. Every brand listed holds a remote general betting standard (real events) licence, and every one takes part in the national GAMSTOP self-exclusion scheme. They are not ranked by tennis offering — the Commission’s register is not a leaderboard — and a licence is not a recommendation: it is the entry ticket. Where one brand is stronger on live streaming, another stronger on each-way terms, or a third cheaper on a same-game multi, that is what each write-up below closes on. The order matches the order of cards in the Commission’s public register, which is the only ordering that does not invent a hierarchy the register does not support.

The table beneath sets out the licence number, the licence holder, and what the operator’s own terms say about tennis. Where a column carries a no-data marker, the operator’s own published terms did not say one thing or the other about that subject, and the brand is reviewed on its other fields.

Two columns of this table stay deliberately empty for most rows: a column repeating the same licence holder structure down the page would tell a reader nothing, and tennis-specific terms do not appear in every operator’s published conditions. The register does not rank; it lists.

London Bet — broad sport book, casino behind it

London Bet combines a sportsbook covering football, tennis, horse racing, greyhounds, darts, golf, cricket, NFL, NBA, MLB and snooker with Pragmatic Play casino slots and a live in-play programme. The remote licence sits with Thistle Bet Limited under account 66162. What it does well for a tennis punter is breadth: every tour-level event runs, and in-play prices update through the match. Where it does less is in premium product — there is no same-game multi worth singling out, no price-boost programme, no live streaming of tennis beyond what the app’s standard video player offers. For a recreational punter betting a tenner on a first-round match and wanting casino games on the same wallet, London Bet is a sensible one-stop choice.

QuinnBet — racing-led, tennis covered

QuinnBet is best known for Best Odds Guaranteed on Irish and UK horse racing from 10:00am daily on singles, multiples and system bets, capped at £150 per customer per race. Tennis does not get the same concession in the published terms. The remote licence is held by QuinnBet (Gibraltar) Limited under account 61011. The tennis book is full and the in-play programme is mainstream; the bonus headlines are racing-shaped. A punter whose interest is split across racing and tennis will find both on one account; a tennis-only punter will not gain anything from QuinnBet that is not on the rest of the shortlist.

Betfair — exchange plus sportsbook, tennis in-play depth

Betfair runs a sportsbook and a betting exchange under one roof. The sportsbook lists in-play betting, Bet Builder, free live streaming of UK and Irish horse racing and football inside the app, and a 90 Minute Payout market — football-only, no tennis equivalent. The exchange lets a punter both back and lay outcomes at prices set by other users; rates and rules specific to exchanges are stated only in Betfair’s terms, not assumed here. The remote licence sits with PPB Counterparty Services Limited under account 39439. For a serious tennis punter who wants to trade in-running rather than take a fixed price, the exchange is the differentiator; for a recreational punter, the sportsbook is a capable mainstream product.

Star Sports — phone-first, race-shaped

Star Sports lets customers dial 08000 521 321 to speak to a trader about opening an account, placing a bet or asking a customer query, with email backup at [email protected]. The remote licence sits with Star Racing Limited under account 9177. The published terms emphasise horse racing and football; tennis is offered without being singled out. The phone channel is the differentiator — for a punter who wants a human on the other end before staking a fiver on an early-round match, Star Sports is the choice on the shortlist.

BetUK — LeoVegas platform, football-shaped welcome

BetUK sits on the LeoVegas Gaming PLC platform under account 39198. Its sports welcome offer pays four £10 free bets (two football accumulators of 4+ selections and two multiples of 2+) when a new customer deposits £10 and places a sports bet within seven days; a tennis single does not satisfy the qualifying bet. A punter who wants to use the welcome bundle must bet on football, not tennis. Beyond the welcome, the sportsbook is mainstream. For a tennis-first punter, the welcome is irrelevant; for a punter who plays football and tennis, the platform is one to weigh.

BoyleSports — straightforward welcome, Irish roots

BoyleSports’ UK welcome offer pays £20 in free bets on a £10 qualifying sports bet; the Irish version pays €30 in free bets on a €10 bet. A tennis single does satisfy the qualifying condition. The remote licence sits with Boylesports Enterprise under account 39469. The book is mainstream across sports, and the welcome is plain — no complex rollover, no mixed-product requirement. For a recreational punter who wants a clean sports welcome and is happy with a British-licensed brand, BoyleSports fits.

888sport — full product, racing-shaped streaming

888sport offers pre-match and in-play betting, Cash Out, Bet Builder, racing streams, BetFinder form tools, a live bet feed and daily boosted odds. The remote licence sits with 888 UK Limited under account 39028. The published terms do not itemise tennis, but the platform covers what a mainstream tennis punter expects: outrights, match winner, set betting, over/under games, handicap, in-play. Where 888sport is differentiated is in product depth — Cash Out, Bet Builder and boosted odds are all live, and the racing streams extend to greyhounds and selected football. Tennis streams are not part of the named offer.

Spreadex — fixed odds and spread on one app

Spreadex combines fixed-odds and spread betting in one app, regulated by the Gambling Commission for fixed-odds and by the FCA for the spread side; the brand warns that spread betting losses can exceed deposits. Cash out is one-click, automatic or partial; Bet Builder runs across fixed-odds or spread markets; live streaming covers UK and Irish horse racing, greyhounds, tennis, NFL and selected football. The remote licence sits with Spreadex Limited under account 8835. For a punter who wants to combine a fixed-odds tennis bet with a spread position on total games or a player performance market, Spreadex is the only one of the ten that does both on one app. For a fixed-odds-only punter, it sits in the mainstream.

DAZN Bet — broadcast brand, mainstream book

DAZN Bet is the betting arm of the DAZN broadcast brand. Deposits start at £5 by debit card, Apple Pay, Paysafecard, Trustly and Skrill, and at £20 by PayPal, with no processing fees. The remote licence sits with DZBT Limited under account 48756. The book covers mainstream sports including tennis; what the deposit terms do not say, on either side, is whether tennis stake limits differ from football. For a punter whose priority is low deposit minimums and mainstream coverage, DAZN Bet is a clean fit; for a punter chasing a tennis-specific edge in the terms, no edge is published.

NetBet — boost-led, multi-product

NetBet offers Daily Boosts, Profit Boosts and free bet offers; a Bet Builder with instant dynamic odds; and a sports stats module for major leagues. The remote licence sits with Netbet Enterprises Limited under account 39170. The platform is mainstream across sports including tennis, and the boost programme is the headline. For a recreational punter who values price boosts over streaming or exchange access, NetBet fits; for a punter who wants a tennis-specific market depth, mainstream coverage is what is published.

What a tennis betting odds price actually is

Every price on a tennis betting slip is built from three inputs: a probability assessment for each player, a margin the bookmaker keeps, and the format the price is shown in. In Great Britain prices appear in fractional form (5/1, 11/4, evens) and decimal form (6.00, 3.75), with evens written as 1/1 in fractions or 2.00 in decimals; odds shorter than evens are called “odds-on”. The conversion is mechanical: a/b in fractions becomes a ÷ b + 1 in decimals, so 5/1 becomes 6.00 and 11/4 becomes 3.75. Some operators, and most betting exchanges, default to decimals.

A market with two players and no draw — match winner is the simplest example — still carries a margin, because the prices on both sides imply probabilities that add up to more than 100 per cent. Take an illustrative two-way market priced at 1.90 and 1.90 in decimals. The implied probability of each outcome is 1 ÷ 1.90, or about 52.6 per cent, and 52.6 + 52.6 = 105.3 per cent. The extra 5.3 per cent is the bookmaker’s margin — the slice of every pound staked that the book keeps across the long run. That margin is not a charge on a single bet; it is a structural deduction across every price the book sets on every market. A 1.85 / 1.85 market carries a margin of about 8.1 per cent; a 1.95 / 1.95 market carries a margin of about 2.6 per cent; a 2.00 / 2.00 market is “evens the money” and carries a margin of zero per cent — though the latter does not exist at a real bookmaker, because the operator would not make money on it.

The same arithmetic drives every other tennis market. Set betting, over/under total games, handicap lines and outright winner markets all build prices from a probability estimate per outcome, and the prices imply probabilities that sum to more than 100 per cent across the full market. The extra is the margin. The tighter the margin, the more of every pound staked is returned to winning punters in aggregate; the wider the margin, the more the book keeps. A punter comparing two operators on the same match is comparing margins under different brand names.

The market margin is a statistical estimate over many bets, not a guarantee for any single wager. A punt on a 1.90 / 1.90 market returns £190 on a £100 stake if it wins — stake 100, profit 90, return 190 — and that is the arithmetic of any single winning bet. What the margin says is what happens across thousands of bets at the same price: roughly 5.3 per cent of total stakes stays with the book, and the rest is returned to winning punters. A single bet at 1.90 that wins pays exactly the same regardless of the market’s margin.

Legal and regulatory frame for tennis betting in Great Britain

Tennis betting in Great Britain is regulated under the Gambling Act 2005 by the Gambling Commission, a non-departmental public body sponsored by the Department for Culture, Media and Sport. Northern Ireland is outside the Act and runs under its own older law, so a Great Britain licence does not extend there. Since the Gambling (Licensing and Advertising) Act 2014 an operator whose remote facilities are used in Great Britain needs a Commission licence wherever it is based, under sections 33 and 36 of the 2005 Act as amended. A Curaçao, Maltese or Gibraltar licence is not a substitute at the point of consumption. There is no state monopoly and no cap on the number of licences; the public register is the test of who holds one.

The five remote betting categories are: remote general betting standard (real events), remote general betting standard (virtual events), remote general betting limited, remote pool betting, and remote betting intermediary — the licence for betting exchanges. Every brand in the top ten above holds the remote general betting standard (real events) category, which covers sports betting including tennis. A search of the public register by business name, trading name, domain or account number is the only check that confirms a brand is licensed; quote no count of licensed operators without its access date.

Minimum age is 18. Since 7 May 2019 operators verify name, address and date of birth before a customer can deposit or gamble, including with a free bet or bonus. Identity verification before the first deposit means no anonymous play at a licensed site; source-of-funds questions at higher spend are normal under the money-laundering rules. The financial vulnerability check (LCCP condition 3.4.4, in force since 30 August 2024) applies to licensed remote betting when a customer’s deposits minus withdrawals exceed £150 in a rolling 30 days; the threshold took effect on 28 February 2025. It is a public-record check (bankruptcy, county court judgments) and not an income check or a credit reference check. The wider “financial risk assessments” — the affordability checks of the press — were announced in a staged plan on 7 July 2026 with no start date.

What may be bet on is not on a statutory list. An operator holds a licence for a category and offers markets under its own rules and the Licence Conditions and Codes of Practice. In-play betting is offered by GB bookmakers and the controls are the operator’s licence conditions and customer-protection duties; never read in-play as legally unrestricted. Esports, virtual events, politics and novelty markets are offered under the same framework with no statutory prohibition found. Spread betting on a non-financial product is inside General Betting Duty; financial spread betting is regulated by the FCA, not the Commission.

A credit-card ban for gambling in Great Britain has been in force since 14 April 2020 (LCCP condition 6.1.2), including credit-card-funded payments through an e-wallet; debit cards and bank-based payments are not covered. There is no state list of permitted payment methods and no rule against cryptocurrency deposits at licensed operators has been established — describe payments only from each operator’s terms. Bonus wagering requirements are capped at 10x since 19 January 2026: a £10 bonus at 50x would need £500 of qualifying bets; under the cap, no more than £100 is required. Mixed-product promotions — offers that require gambling on two or more product types, such as “bet on football to get free spins” — are banned. Whether the cap applies to free bets with no wagering condition, and any cap on the bonus money itself, are not established.

The player pays no tax on betting winnings in Great Britain — general information, not advice. General Betting Duty is the operator’s tax on gross profits, currently 15 per cent; from 1 April 2027 a new remote betting rate of 25 per cent applies within it, while remote bets on UK horse racing, self-service betting terminals in licensed premises, pool betting and in-person betting stay at 15 per cent (HM Government policy paper of 26 November 2025). Until 1 April 2027 the remote rate stays at 15 per cent; whether operators pass duty through odds is not established. The Commission’s statutory levy is a separate charge.

Offshore, providing gambling facilities in Great Britain without the licence the Act requires is an offence under section 33 of the Gambling Act 2005 — up to 51 weeks’ imprisonment, a level-5 fine, or both (six months in Scotland). It is aimed at the operator, not the customer. A customer betting with an unlicensed site loses British protections: no GAMSTOP coverage, no Commission complaints route, no approved dispute-resolution body, no British consumer redress if funds are withheld, and not bound by the 10x bonus cap or the £150 vulnerability check. Enforcement is disruption: cease-and-desist notices, search-engine referrals, work with registrars, hosts and payment providers, and court-order DNS blocking powers given or about to be given to the Commission. Honest framing: licensed = checks, limits, GAMSTOP, bonus cap, but also verification before the first bet; unlicensed = none of those protections and possible loss of funds. Neither is “the safe choice” by default.

Responsible gambling at a British-licensed tennis bookmaker

Every brand on the Commission’s public register takes part in GAMSTOP, the national multi-operator online self-exclusion scheme, which has been a mandatory licence condition for online operators since 31 March 2020. Self-exclusion periods are six months, one year, five years, or five years with auto-renewal; after the minimum period the exclusion stays in place for a further seven years unless the customer asks GAMSTOP to remove it. GAMSTOP covers online sites and apps; betting shops use a separate service. A punter who wants to stop betting across every British-licensed tennis bookmaker at once registers once with GAMSTOP and the brand closes the account.

Deposit limits are an obligation on the operator (RTS 12): operators must offer a gross deposit limit on a fixed time frame; the first changes have applied since 31 October 2025, a second phase was postponed to 30 September 2026, and whether it is in live operation is not established. There is no state-set deposit or loss ceiling — limits are the customer’s choice. Timeouts, reality checks and product blocking are available at every licensed brand. Help is the National Gambling Helpline via GamCare, GambleAware, NHS gambling clinics and Gamblers Anonymous; these are signposted from every licensed operator’s safer-gambling page and from GAMSTOP.

The financial vulnerability check (£150 in a rolling 30 days in deposits minus withdrawals) is a public-record check, not an income check, and exists to flag customers in financial distress. Punters who hit the threshold are not barred; they are asked to confirm details and the operator may set a deposit limit or close the account. A punter who knows the threshold is approaching can pre-set a deposit limit below it on the operator’s safer-gambling page and avoid the question altogether.

Crypto, e-wallets and payments on a British-licensed tennis book

There is no British rule against cryptocurrency deposits at a licensed operator — that has not been established — but identity verification before the first deposit rules out anonymous play at any brand on the Commission’s register. A punter who holds bitcoin and wants to use it for tennis bets is restricted to operators whose own terms accept it; on the shortlist above, no brand publishes crypto as a deposit method. Most licensed operators accept debit cards, bank transfers, PayPal, Skrill, Neteller, Apple Pay, Paysafecard and Trustly; some accept PayPal only above £20. Credit cards are banned for gambling in Great Britain since 14 April 2020, including credit-card-funded payments through an e-wallet; debit cards are not covered.

A punter who values low minimums will find DAZN Bet’s £5 floor across five methods the most generous on the shortlist. A punter who wants fast withdrawals sees instant deposits and fast withdrawals named in the published terms of multiple brands — the generic list is of brands that publish it; specific withdrawal times are in each operator’s help pages. Source-of-funds questions at higher spend are normal under the money-laundering rules and not a sign of a problem.

Bonuses and free bets on tennis

Promotion rules in force since 19 January 2026 cap bonus wagering requirements at 10x and ban mixed-product promotions. A £10 bonus at the old 50x would have needed £500 of qualifying bets; under the cap no more than £100 is required, and most welcome offers on tennis sit well below that. Whether the cap applies to free bets with no wagering condition, and any cap on the bonus money itself, are not established — describe each offer only from each operator’s own terms.

A free bet pays the winnings only — the stake is not returned. A £10 free bet at 3.00 returns £30 (£10 × 3.00 minus the £10 stake that is forfeit), not £30. A price boost raises the price on a chosen selection by a stated margin; the boost pays at the boosted price and the stake is returned with the winnings. Acca insurance refunds the stake of an accumulator that loses by one leg, usually as a free bet. Cashback on a net-loss period returns a share of net losses, usually as a free bet or bonus funds. Enhanced odds and price boosts can be structurally similar but are settled on different terms; each offer’s terms say which kind it is.

A welcome offer for tennis is best read by the qualifying bet: a £10 sports bet on tennis single satisfies the BoyleSports welcome; it does not satisfy the BetUK welcome, which pays four football-shaped free bets. A punter who plays both sports can use BetUK’s bundle; a tennis-only punter should weigh BoyleSports or another brand whose qualifying bet is tennis. Wagering requirements are the second number to read; a 1x rollover on free-bet winnings is the lightest on the shortlist, a 10x is the cap. Deadlines vary by brand and are stated in the offer terms.

Mobile and app tennis betting

Every brand on the shortlist has an iOS app at minimum, and most have Android apps; DAZN Bet, NetBet, Betfair, 888sport, Spreadex, BoyleSports, London Bet, BetUK, QuinnBet and Star Sports all appear in the British App Store with sports betting as a feature. The Apple Pay deposit option is named by DAZN Bet; QuinnBet’s terms name a wide payment range; Betfair’s app emphasises live streaming and Bet Builder. bet365, not on this shortlist but the most downloaded sports betting app in the UK per its own App Store description, runs a Bet Builder+ that combines markets from one event into a single bet available pre-match and in-play, with Super Boosts and Winnings Boosts on Bet Builders and selected singles.

In-play pricing through a mobile app is the same product as through a desktop site, and the experience is faster to judge on touch: scrolling a tennis outright market, locking in a set-betting price at the changeover, taking a partial cash out. The risk on mobile is the same as on desktop — every licensed operator verifies identity before the first deposit, and the verification step takes longer on a phone if the camera does not read the document first time. A punter who values the verification step wants to do it on a desktop before going mobile.

Live betting, cash out and the in-running tennis market

Tennis is one of the deepest in-running markets in British-licensed betting. Every set change, every service break, every medical timeout moves the match-winner price; over/under total games moves on every completed game; handicap lines reset at the start of every set. Live streaming of tennis is published by Spreadex’s app — UK and Irish horse racing, greyhounds, tennis, NFL and selected football — and by Betfair’s app for UK and Irish horse racing and football. Other brands on the shortlist stream racing rather than tennis in the named offer.

Cash out is full or partial on Betfair, Spreadex and 888sport in their named feature lists. Partial cash out locks in a share of the current cash-out value and leaves the rest running. One-click and automatic cash out are Spreadex specifics. A punter chasing cash out on tennis in-running will find it on these three brands; a punter who needs live streaming of tennis will find it on Spreadex and on whatever else the operator publishes. The 90 Minute Payout market on Betfair is football-only — no tennis equivalent is published.

The in-running margin is wider than the pre-match margin by a few points — books defend against sharp in-running punters — and the speed of price update varies by brand. A punter who relies on in-running tennis prices has to weigh both: the depth of the markets and the speed of update.

Predictions, models and what a punter can know in advance

No system reliably predicts the outcome of a tennis match. Anyone selling one is selling certainty that does not exist. What a punter can know in advance is narrower: the surface (hard, clay, grass), the format (best of three or best of five), recent form on the surface, head-to-head, scheduling and fitness, the draw, and the tournament context. A model that uses only these inputs is doing what a careful bettor does manually; a model that claims more is claiming what the match cannot deliver. Tennis is more predictable than most team sports on a single-match basis because the variables are narrower, but the bookmakers know that too and price accordingly.

Bankroll management is the part of a betting strategy that a punter controls and a tipster cannot. Staking a fixed percentage of bank on each bet — one or two per cent is common — limits the damage of any single loss. Chasing losses by raising stakes after a losing bet is the most common way a recreational punter’s bank runs out. A punter who wants to bet on tennis regularly and keep doing so treats the bankroll as the bet, not the match.

Free betting tips for today’s tennis fixtures are widely advertised. Most are recycled previews or affiliate-led and add no value the punter cannot get from the operator’s own form tools. BetFinder on 888sport, sports stats on NetBet, and the price comparison across bookmakers on a betting exchange are the inputs a punter can actually use; tipster sheets that arrive by email are inputs of unknown provenance.

Bet types and tennis-specific markets

Match winner is the base market — pick the player who wins more sets. Set betting names the exact score (2-0, 2-1 in a best-of-three; 3-0, 3-1, 3-2 in a best-of-five). Over/under total games sets a line on the match’s combined games — 20.5, 22.5, 24.5 are common — and the punter backs over or under. Handicap gives one player a games or sets head start — a -3.5 game handicap on a server means the selection must win by four games or more. Outright winner is the tournament winner; each-way terms vary by event and operator.

Same-game multi — the British equivalent of a bet builder — combines markets from one match into a single bet. A 2-0 set betting combined with under 20.5 games at 5/1 is one bet that pays only if both legs win; the odds multiply into one price. Bet Builder with dynamic odds (NetBet’s named feature) and Bet Builder+ (bet365’s) do the same thing under different brand names. Cash out on a same-game multi is usually full-only and is settled at a discount to the implied price because the bookmaker’s margin compounds across legs.

A combination bet (accumulator or “acca”) on tennis strings match winners from different fixtures into one bet; the odds multiply into one price, and a 1.50 / 1.50 / 1.50 treble gives 3.375. Acca insurance refunds the stake as a free bet if one leg loses. A punter chasing an acca insurance on tennis should check the brand’s terms — the named feature on the shortlist is offered across several brands. Each-way tennis is rare on singles because tennis does not pay a quarter or a fifth of the odds for a place; outright winner each-way is a different bet and the place terms vary by event.

A betting exchange runs back and lay markets on the same match. A back bet is a bet that an outcome happens; a lay bet is a bet that it does not, at the price the layer quotes. The exchange takes a commission on net winnings rather than a margin baked into the price, which is why exchange prices on a tennis match can be sharper than a sportsbook’s — but the liquidity on a lower-tier event may be thin.

Worked example: how a margin changes what a winning tennis bet pays

Take an illustrative two-way match winner priced at 1.90 and 1.90 in decimals (fractional 9/10 — nine to ten, odds-on). A £100 stake on either player returns £190 if it wins — stake 100, profit 90, return 190 — and that is the arithmetic of any single winning bet. The market margin, computed across both outcomes, is one minus the reciprocal of the sum of the implied probabilities:

• implied probability each side: 1 ÷ 1.90 = 0.5263, or 52.63 per cent
• sum of implied probabilities: 0.5263 + 0.5263 = 1.0526, or 105.26 per cent
• payout share: 1 ÷ 1.0526 = 0.9500, or 95.00 per cent
• margin: 1 − 0.9500 = 0.0500, or about 5.00 per cent

The headline price on each side is 1.90 — 9/10 in fractions, ninety pence profit on every pound staked — and that is the number a recreational punter looks at. The number that determines how much of every pound staked the book keeps across many bets is the 5.00 per cent margin. A market at 1.85 / 1.85 carries a margin closer to 8.1 per cent; a market at 1.95 / 1.95 carries a margin of about 2.6 per cent. The price a punter is quoted does not change — what changes is how much of the total stake pool the book keeps over thousands of bets.

A £100 bet at 1.85 / 1.85 returns £185 if it wins. The same £100 bet at 1.95 / 1.95 returns £195 if it wins. The £10 difference is real and is paid by the bookmaker, but it comes out of a market that is, on average across many bets, more expensive to bet on at 1.85 than at 1.95 — the bookmaker keeps more of every pound staked on the 1.85 market.

The market margin is a statistical estimate over many bets under the assumption that all outcomes are priced at the published prices and the market settles to those prices, not a guarantee for any single wager. A winning bet at 1.90 pays the same regardless of the market’s margin.

Frequently asked questions about tennis betting odds

How is the return on a tennis bet worked out from the stake and the odds?

Return equals stake multiplied by the decimal odds; net profit equals stake multiplied by odds minus one. A £10 stake at 3.00 returns £30 — stake 10, profit 20, return 30. A £10 stake at 1.50 returns £15 — stake 10, profit 5, return 15. The arithmetic is the same on every selection, every market and every British-licensed brand.

What does the bookmaker’s margin mean, and how can it be seen in the odds?

The margin is the share of every pound staked the bookmaker keeps across many bets. It is not a charge on a single bet. It appears in the prices as the gap between the implied probabilities and 100 per cent. A 1.90 / 1.90 market sums to 105.26 per cent, and the extra 5.26 per cent is the margin; a 1.95 / 1.95 market sums to about 102.56 per cent and carries a margin of about 2.56 per cent.

How can it be checked that a bookmaker holds a Gambling Commission licence?

Search the Commission’s public register by business name, trading name, domain or account number. Every brand on the Commission’s register holds a remote licence for the categories it operates under, and every one takes part in GAMSTOP. The register is the whole test; quote no count of licensed operators without its access date.

What is an accumulator insurance on tennis?

A free-bet refund of the stake if one leg of an accumulator loses. The refund is usually a free bet, not cash, and the free bet’s stake is not returned with a win. Each brand’s terms name the minimum number of legs, the minimum odds per leg and the maximum refund — the headline is not the offer.

What is a same-game multi on tennis, and how does it differ from a betting exchange?

A same-game multi combines markets from one match into one bet; the odds multiply into one price and the bet pays only if every leg wins. A betting exchange lists back and lay prices set by other users and takes a commission on net winnings rather than a margin baked into the price. The exchange can be sharper but is thinner on lower-tier events; the same-game multi is one bookmaker’s price.

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