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PARIS — Rafael Nadal and Roger Federer have covered so much ground together in 15 years and 39 matches, from playing for keeps in the fading light at Wimbledon to trying to make it through a promotional video without falling off their chairs laughing.
But on Friday, in their much-anticipated French Open semifinal, these amicable nemeses, whose rivalry has worn so well, got the chance to experience something new — even if the final result, a decisive Nadal victory at Roland Garros, was nothing novel.