When I trade tennis I follow the matches live on Bet365 and use the excellent Tennis Trader next to the live pictures.
I addition I use live mach statistics at Flashscore.com. The latter is fast and quite good, but I miss some stats.
Flashscore has most of what I will need to trade if I come in to a new match let us say at the start of 2. set.
But I miss UNFORCED ERRORS and WINNERS which Flashscore does not provide live.
There a dozens of tennis stats sites out there, but anyone with "Unforced errors" + "Winners" included?