the biggest one is his lack of aggression on hardcourts and carpet.
too often after an unsuccesfull attack he switches into defensive moonballing mode
and the player with the right weapons tears him apart. and he has the game to be agressive.
guess it's just his nature chasing balls and moonbaliling
good one. he definitely has to adopt a more assault minded approach on hard courts. its either attack or be attacked on hard courts.