Federer's record on clay stands up to scrutiny... but even Bradman fell to bowlers once in a while! In terms of record he's just beginning.. and has a way to catch up with, say, Sampras... but what marks out Federer is the sense that there's just nothing he can't do... there's no way you could try and force him to play that he would find uncomfortable.

You might hope to beat him by catching him on a day when he's playing less than his best... and getting a bit of luck... but that's not quite the same thing.

My first thought is that Tendulkar, Lara and Viv Richards have all, at least on occasion, appeared impossible to bowl to... or at least... too complete as players to be troubled by the actual attack they faced at that moment on that particular pitch. I think what Agassi was sayng of Federer is that he couldn't see how any player on any surface would get at him... and I wonder if that's the way we should think of Bradman.