Tennis trading means backing and laying a player on a betting exchange during a match, so you can lock in a result before the final point. Tennis suits trading because a match has only two outcomes and the price moves with almost every game. This guide explains how tennis prices move, the back and lay sums with worked examples, and the risks that catch most new traders out.
The maths is the same as in our guide to greening up a trade. Only the market is different.
The short version
- A tennis match odds market has two runners, so every price move shows up clearly.
- Holds of serve are expected. Breaks of serve move the price the most.
- Backed first? Lay stake = back stake × back odds ÷ lay odds.
- Laid first? Back stake = lay stake × lay odds ÷ back odds.
- In-play markets have a bet delay, and TV pictures can lag behind the court.
How tennis trading works on an exchange
In tennis trading, you open a position with one bet and close it with an opposite bet once the price has moved. For instance, you might back a player before a key service game and lay them after they break serve. If the price has moved your way, you lock in a profit on both outcomes.
Because the market only has two runners, backing one player is much like laying the other. That keeps the sums simple. It also means there’s no draw to worry about, unlike most football trading.
What moves tennis prices
Most of the time, the player serving is expected to win the game. So a hold of serve usually moves the price only a little. A break of serve is different: it changes who is ahead in the set, and the price can move sharply.
- Breaks of serve. The biggest single moves within a set.
- Winning or losing a set. Another big move, especially in best-of-three matches.
- Break points and deuce. The price starts to move before the game ends.
- Tiebreaks. Each point can swing the price both ways.
- Injuries and medical time-outs. These can move the market quickly and unpredictably.
In men’s Grand Slam matches, played over five sets, a single break matters less, because there’s more time to recover. As a result, prices often move less per break than in a best-of-three match.
Worked example: back first, lay after a break
Worked example
Before the match, you back Player A for £20 at 2.50. Early in the first set, A breaks serve and the price shortens to 2.10.
- Lay stake: £20 × 2.50 ÷ 2.10 = £23.81.
- If A wins: the back pays £20 × 1.50 = £30. The lay costs £23.81 × 1.10 = £26.19. Net: +£3.81.
- If A loses: the lay wins £23.81, and the £20 back stake is gone. Net: +£3.81.
Commission is then taken from the net win. At 2%, that’s about 8p.
Worked example: lay first, back after a break
Worked example
You lay a strong favourite for £20 at 1.60, so your liability is £20 × 0.60 = £12. The favourite drops serve, and the price drifts to 1.90.
- Back stake: £20 × 1.60 ÷ 1.90 = £16.84.
- If the favourite wins: the back pays £16.84 × 0.90 = £15.16. The lay costs £12. Net: about +£3.16.
- If the favourite loses: the lay wins £20, and the £16.84 back stake is gone. Net: +£3.16.
The quick check is £20 × (1 − 1.60 ÷ 1.90) = £3.16.
Of course, both trades could have gone the other way. If Player A had been broken instead, closing the trade would have locked in a loss of a similar size.
Green-up calculator
Enter your opening bet and the price you can close at now. The calculator gives the closing stake and your result on both outcomes, before and after commission.
Green-up calculator
Tennis trading risks that catch people out
First, the bet delay. Exchanges hold in-play bets for a few seconds before placing them, so the price can move while you wait. As a result, your closing bet may be matched at a worse price, or not at all.
Second, pictures lag behind the court. TV and streaming feeds are usually a few seconds behind live play. Meanwhile, other traders may have faster data, so the price can move before you see the point.
Third, retirements. If a player retires injured, the market is settled under the exchange’s own rules, and these differ between exchanges and bookmakers. Always read the market rules before you trade, because a retirement can leave an open position settled in a way you didn’t expect.
Finally, liquidity. Big matches have plenty of money waiting at each price, but early rounds of smaller events can be thin. In a thin market, you might not be able to close your position when you need to.
The honest limits of tennis trading
Trading doesn’t create value on its own. Closing a position simply spreads the result of a price move across both outcomes. To make money over time, your opening bets need to be at better prices than the market deserves, after commission.
So keep stakes small, keep a record of every trade, and keep your trading money inside a fixed budget. Our guides to betting records and bankroll management explain how. You can also use implied probability to see what any price says about a player’s chance.
Before you open an exchange account, check the operator is licensed by the Gambling Commission.
Related guides
18+ only. Betting should be fun, and every bet can lose. Set a budget you can afford to lose and stick to it. For free, confidential support, visit BeGambleAware.org or call the National Gambling Helpline on 0808 8020 133.