Nadal on clay definitely. You could probably pick one of any number of matches, and I think therein lies the problem. He's been so dominant on the surface for so long that his great performances don't really stand out, it's almost taken for granted - oh look, another great rafa display on clay... I honestly thought his performance against Murray in last years RG semi was as good as anything I've seen from him. On the women's side, Serena's performances at the 2012 olympics - vs Azarenka and Sharapova - almost had me falling out of my chair in laughter at the sheer brutality of it. I'm curious what older posters think of the 84 RG final between Evert and Navratilova. Never seen it, but with a score of 6-3, 6-1 Martina must have been on a different planet.