English Tennis is the second most popular sport in the bookmaker business. The margin on tennis bets is usually lower (for the player) than on less liquid sports. The exception is matches involving well-known tennis players, even if there is only one. In this case, one of the legs of the surebet or middle may turn out to be overvalued, giving the player fairly broad opportunities to take advantage of this imbalance and earn money.
You do not have to delve into an analysis of the reasons why a surebet arises; you can simply bear in mind that when a large number of tennis matches are taking place, especially when Grand Slam tournament matches are being played, the probability of good surebets appearing increases sharply, and a professional betting player should take advantage of this.
It is quite possible to earn money on tennis.