He has no weapon. He does not have enough power on his groundstrokes or serve. He does not have the consistancy for clay or defensive tennis.
its weird, because i was at french open qualies this year, and trust me that match vs kudla was the best tennis i ve seen him playing by far, and i thought he would start to win a lot afterwards. but he failed to do that, had a pretty ugly loss in qr1 in wimbledon and is slumping mostly now. he could even not make the cut into us open qualies...first time in how many years? i mean, its really sad. i think he is talented enough