English Tennis is the second most popular sport in the bookmaker business. Tennis bet margins are generally lower (for the player) than those of less liquid sports. An exception is the matches of famous tennis players, at least one of them. In this case, one of the surebet legs or middles may be overvalued, giving the player broad opportunities to play on this bias and win.
It is impossible to go into an analysis of the causes of surebets appearing, but it is sufficient to note that when there are a large number of tennis matches, especially if there are Grand Slam tournament matches, the probability of good bets appearing increases dramatically, which should be used by a professional betting player.
It is even possible to make money in tennis.