American tennis player John Isner defeated the all time Grand Slam winner Roger Federer, 4-6, 6-3, 7-6 (4), 6-2, in the first round of the Davis Cup.
Isner's shocking win over Federer put the Americans ahead of the Swiss, 2-0, that virtually clinched a spot in the quarterfinals of the Davis Cup.
Isner, best known for his marathon win over Nicolas Mahut at Wimbledon in 2010, was behind early after Federer won the first set in 29 minutes, but Isner used his best trait, his serve, to break Federer down.
Even on red clay, where the ball moves slower, Isnber's serve proved to be too much for Federer. After Isner found his serve, Federer was pretty much done. He could not capitalize on break points and blew a 0-40 lead in the fifith game of the fourth set. After that collapse, Federer could not recover and Isner won the final four games to knock off Federer.
Federer said of Isner's surprising performance, "I thought he played great, he played it tough and served great when he had to. I just missed a couple more opportunities than he did and that's what cost me the match."
The Americans earlier in the day took the first match in the best of five series versus Switzerland with a thrilling five set win for Mardy Fish over Stanislas Wawrinka.