Here is what I do:
Step 1) I will find a good matchup, where both players have a good chance to win the match.
Step 2) Then I will watch the match and wait for the first break to come.
Step 3) Now I will bet on the player who was broken or lay the player who broke (I will only bet if here is a break in one of the first 4 games of the 1st set).
Step 4) Then I will wait and hope the player who was broken will re-break and get back to "equal" at some point doing the match. And then I will make a surebet.
Player 1 odds 2.10 - Player2 odds 1.9 before start of the match.
Player2 break in game 3 and the score is now 1-2 in 1st set Player2 to serve. Odds are now 3.00 and 1.50. I make place a bet on Player1 @3.00.
Later in the 1st set Player1 breaks back, and the score is now 5-5 and the odds 2.05 and 1.95. I buy bet Player2 @1.95, and I have made a surebet of about 18%
Often you can make much more because of the many breaks in the in WTA matches. Depending on how big a risk you are willing to take, and how patient you are. I also like to lay a player who has won the first set by 6-0 or 6-1. Of cause they will win 2nd set too sometimes, and I loose, but very often they don't, and I can make a huge surebet, because of the big difference in the odds. I have often seen 1.05 or lower cracked.
It's a strategy that takes time and practice to master, but can be very profitable if you learn when to buy and when you have to get out of it. Try to watch some games and follow the marked prices, look at the graphs.
This strategy can also be used to bet on other sports, but be careful. I have used it on basketball, volleyball and ATP tennis too with succeed, but the most important thing is to find the games where you expect big up and down swings doing the match.
A good site to check tennis stats and stuff: Match Stat