Originally Posted by edmondsm
Isner's problem is he can't beat the lower ranked players bad enough. He plays long matches in the opening rounds and is burned out by the time he gets to the higher ranks.
that is the Problem when you cannot return. ripping aces and FH winners at your own serve is great but if you always go to the tiebreak you will also lose some even against lesser Players. that means Long matches.
he can beat anyone in a single set but also lose since every set with him will come down to a handfull of Points (usually in the tiebreak)