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Federer vs Nadal - Madrid 2011 SF (HD)Rafael Nadal celebrates his second successive victory over Roger Federer. He was pushed close by Roger Federer, but World No. 1 Rafael Nadal remains unbeaten on clay in 37 successive matches after holding off his Swiss rival to prevail 5-7, 6-1, 6-3 on Saturday in the semi-finals of the Mutua Madrid Open."I don't think it was our best match for either of us, I think we both made some errors, more than usual," reflected Nadal. "The difference between the good players and the best ones is that when you play badly you win; that is what the best players do. I think that at moments Roger played very aggressive and great tennis and in other moments he had more mistakes than usual. So the match was a little bit up and down, but for sure it's always a special match against each other. It's a pleasure to play against him -- always an honour."The Spaniard lost the first set for just the second time in his past 37 clay-court matches, but rebounded strongly to record his second win in two meetings with Federer this season. Victory from behind also reversed the trend in the Federer-Nadal rivalry that had seen the winner of the first set go on to win their past 12 clashes.The 29-year-old Federer was hoping to be the player to snap a Nadal clay-court winning streak for the third time, having ended the Spaniard's 81-match winning run in Hamburg in 2007 and halting him on 33 successive clay wins in the 2009 Madrid final. Nadal's last loss on a clay court came at the hands of Sweden's Robin Soderling in the 2009 Roland Garros fourth round. In that time he has lost just four sets.