English Tennis is the second most popular sport in the betting business. The marginality of tennis betting is usually lower (for the player) than for less liquid sports. The exception is games with participation at least one famous player. In this case, one of the arms of a surebet or a middle may be overrated, which offers the player enough possibilities to use this offset and earn well.
You do not have to go deep into the analysis of causes of a surebet, but only note that if there are a lot of tennis games, especially when Grand Slam tournaments take place, the probability of a good surebet increases dramatically, and a professional bet player should take advantage of it.
So, it is possible to make money off tennis.