A) I loathe it when players call trainers/doctors/take bathroom breaks when they're losing. It could be real, but sometimes it's so obvious that it's not.
1. Robredo today
2. Rafa yesterday
It just proves that in that moment they're sore losers.
B) Coaching during the match is annoying as well. I mean if the player isn't prepared or isn't playing as good as the opponent then they should act like pros and get their act together without the help of their coaches, or lose.
C) I also hate it when players are dishonest. That Henin-Hardenne/Williams thing was terrible. You can't call youself a true champion if you can't replay a point!
D) It's quite funny sometimes when players do things to distract their opponents, i.e arguing with the umpire, grunting too loudly, moving around too much when the person is serving, etc. But sometimes it goes so far that it embarresses you as a fan. I don't mind it when players get emotional just so long as they forced the error or applied the pressure, but on occasions some of them take it to a whole new level!
Anything that annoys you?