To help me decide easier which bets to take I use these sites:
My bets are usually correct score sets: 2-0 (or 3-0 in big tournaments). To do that bet I select games from bookmaker's offer.
Step 1) I like to bet on strong favourites to win with straight odds about 1.20~1.50 (but odds aren't main factor for choosing my bet) and I select from offer games with indicated odds;
Step 2) search info about surface that games are played at http://tennis.matchstat.com or official tournament webpage. Surface is very important in tennis and a good player can become bad player on other surface;
Step 3) now exclusion part: at first step I selected almost blindly games (only looking at odd). From games I selected at step 1, I check whether all favourite players ( favourite is made by bookmaker ) are strong enough on surface that is played.
--- I exclude players with poor performances on playing surface (false favourite): I check winnig /losing record on this surface and current form (he is losing/winning lately ? winning gives to a player peace);
--- search for serve percentages , average serving speed or returning bals percentage won (he is a fighter)
Odds for straight win were about 1.2~1.5 but if that player is really favourite he should be able to win in straight sets : 2-0 ( or 3-0 ) and odds for correct score are bigger: from 1.2 at straight win , at least 1.6 for 2-0 ; from 1.4~1.5 at straight win , at least 1.9 ~2.0
Money management: fixed amount of money bet evey time. Check bookmaker tennis rules!!! Sometimes players are injured and they have to retire. Is better to place bets on bookmakers with "match completed" rule.
My statistic (average) from 78 games with 2-0 and 3-0 bets:
53 winning bets, average odds 1.87
25 losing bets, average odds 1.95