The King Of Clay - Rafa Nadal
In these graphics you can see that Rafa Nadal has an exceptional 86% wins against Roger Federer on clay and 85% against the actual No 1 in the World, Novak Djorkovic.
For those of you not understanding Spanish, tierra batida is clay, cemento is hard,and hierba is grass.
Novak shows his supremacy on hard courts with 11 wins to 5 loses against Rafa, and 9 wins against 11 defeats against Roger Federer.
But overall, Rafa has a 64% win rate against Roger, and 56% against Novak.
So the King of Clay yes, but overall against these two, he is still The King.