Tennis trading on a betting exchange: how prices move

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 well: 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 exactly the same as in our guide to greening up a trade. Only the market is different.

Key points

  • A tennis match odds market has just two runners, so every price move is easy to see.
  • Holds of serve are expected, and 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

You open a position with one bet and close it with the opposite bet once the price has moved. You might back a player before an important service game and lay them after they break, for instance. If the price has moved your way, you lock in a profit whoever wins.

With only two runners in the market, backing one player is much the same as laying the other, which keeps the sums simple. There is no draw to worry about either, unlike most football trading.

What moves tennis prices

The player serving is usually expected to win the game, so a hold of serve normally nudges the price only slightly. A break 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.
  • Taking or dropping a set. Another big move, especially over best of three sets.
  • Break points and deuce. The price starts moving before the game is over.
  • Tiebreaks. Every point can swing the price either way.
  • Injuries and medical time-outs. These can move the market fast and unpredictably.

In men’s Grand Slam matches, played over five sets, a single break matters less because there is more time to recover, so 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 £25 at 2.30 (prices for illustration only). Early in the first set Player A breaks serve and the price shortens to 1.95.

  • Lay stake: £25 × 2.30 ÷ 1.95 = £29.49.
  • If Player A wins: the back pays £25 × 1.30 = £32.50 and the lay costs £29.49 × 0.95 = £28.01. Net: +£4.49.
  • If Player A is beaten: the lay pays £29.49 and the back returns nothing. Net: +£4.49.

Commission then comes off the net win, about 9p at 2%.

Worked example: lay first, back after a break

Worked example

In an early-round match you lay the clear favourite for £30 at 1.50, a liability of £30 × 0.50 = £15. The favourite drops serve and the price lengthens to 1.75.

  • Back stake: £30 × 1.50 ÷ 1.75 = £25.71.
  • If the favourite wins: the back pays £25.71 × 0.75 = £19.29 and the lay costs £15. Net: about +£4.29.
  • If the favourite is beaten: the lay pays £30 and the back returns nothing. Net: +£4.29.

The quick check is £30 × (1 − 1.50 ÷ 1.75) = £4.29.

Either trade could easily have gone the other way. Had the break gone against you, closing the position would have fixed a negative result 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

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, and your closing bet may be matched at a worse price or not at all.

Second, pictures lag behind the court. TV and streaming feeds usually run a few seconds behind live play, while 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 settles under the exchange’s own rules, which differ between exchanges and bookmakers. Read the market rules before you trade, because a retirement can settle an open position 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, and in a thin market you may not be able to close your position when you need to.

The honest limits

Trading doesn’t create value by itself. Closing a position just spreads the result of a price move across both outcomes, so to come out ahead over time your opening bets need to be at better prices than the market deserves, after commission.

Keep stakes small, record every trade and keep your trading money inside a fixed budget. Our betting records and bankroll management guides explain how, and implied probability shows what any price says about a player’s chance.

Before opening an exchange account, check the operator is licensed by the Gambling Commission.

Related guides

18+ only. Betting should stay fun. Set a budget before you start, only bet what you can comfortably afford, and take a break whenever you need one. For free, confidential support, visit BeGambleAware.org or call the National Gambling Helpline on 0808 8020 133.

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