Tennis Insight is with out doubt one of the best sites for tennis betting. There is a small fee to join but once a member you can leave insight into matches and that is rewarded with free membership time.
They run a tipster competition throughout the year where the prize is extended membership to the site. It allows you to see which members are the best at picking winners and gives you an idea of which matches and players to bet on.
For each tournament on the ATP Tour and WTA Tour, Tennis Insight offers comprehensive statistics on every match. Ranging from head to head records, surface stats, recent results and ROI figures for different surfaces.
The stat filter allows you to search different stats for each player. For example you could find out the record of a player on grass courts against top 50 opponents when priced at 2.00 or above.
Recently a new section called THE RACKET has been added offering info from around the Tennis World. Tennis Insight is well worth the small yearly fee if you are a keen tennis punter.