We all know he is a very athletic player who supposedly wastes his talent on showmanship. We all saw his amazing run in US Open before he broke down mentally to Federer and his late season surge. Do you think he has what it takes to win a slam? What I think is his problem is his mentality and stamina, other than that he can beat anyone if he puts his mind to it. Notably in his match vs Federer has visibly exhausted in the match despite outplaying him throughout. If he improved his stamina and mentality what threat do you think he'd pose? His injuries I think stem from his antics. What do you think? I think he is among the underachievers of the sport along with Tsonga, Berdych etc.