Gustavo Kuerten was the one to prove how vastly overrated a clay courter Federer is at the 2004 French Open. Kuerten was way past his prime, his career virtually ruined by a major hip injury late in 2001. He was no longer top 30 caliber and struggling to win matches consistently on tour. Yet a prime Federer allowed a hip crippled Kuerten way past his prime to destroy him in straight sets in the 3rd round of 2004 French Open. The same Kuerten who a year earlier couldnt even beat Tommy Robredo, and that very French Open couldnt beat David Nalbandian. That just shows how vastly overrated a clay courter Federer is. If he lost 6-4, 6-4, 6-4 to hip crippled Kuerten he would have no shot to win even a single match vs prime Kuerten on clay. That also proves he is even weaker on clay then even those players who had an outside shot of beating prime Kuerten on clay- Kafelnikov, Medvedev, Moya, Corretja, Rios, and many others. Heck I am not sure if he even better than Sampras on clay anymore.