Rafael Nadal and Roger Federer have played each other 22 times on hard courts, grass and clay. Now, for the first time in six years, the best rivalry in tennis is back on U.S. soil. Rafa and Roger will meet Friday night in the semifinals at the Sony Ericsson Open. Their most recent matchup in North America took place on the same court in 2005, when Federer beat Nadal for the Key Biscayne title. "We really get up for these kind of matches against each other because we know the world is watching," Federer said. "We always have these incredible points and incredible matches." The top-ranked Nadal advanced to the semifinal showdown by beating No. 7-seeded Tomas Berdych 6-2, 3-6, 6-3 on Thursday night. Federer won earlier without breaking a sweat when Gilles Simon retired with a stiff neck after losing the first three games. Read more: http://sports.espn.go.com/sports/tennis/news/story?id=6277849
