Roger Federer got another chance at Jo-Wilfried Tsonga in a Grand Slam quarterfinal – and beat him. Now Novak Djokovic gets another shot at Federer. Federer reached his eighth consecutive semifinal at the US Open by beating Frenchman Tsonga 6-4, 6-3, 6-3 Thursday night in a match delayed about 1 1/2 hours by rain in the first set. At Wimbledon in late June, Tsonga upset 16-time major champion Federer in the quarterfinals after dropping the first two sets. Until that loss, Federer was unbeaten in 178 matches when taking a two-set lead in a Grand Slam match. Now Federer faces top-seeded Novak Djokovic in the US Open semifinals, the fifth straight year they will play in New York. Federer holds a 3-1 edge. In their most recent head-to-head meeting, in this year's French Open semifinals, Federer ended Djokovic's 43-match winning streak. Djokovic advanced to the semifinals after Serbian Davis Cup teammate Janko Tipsarevic retired while trailing 7-6 (2), 6-7 (3), 6-0, 3-0. Djokovic has reached his sixth consecutive major semifinal and improves to 62 wins from 64 matches in 2011. No. 20 Janko Tipsarevic had his left hamstring bandaged by a trainer at 5-0 in the third set, before later deciding he couldn't finish. Djokovic needed his own visit from the trainer for treatment on a bloody left big toe after sliding to get to a drop shot in the fourth set's opening game. Defending champion Rafael Nadal, Andy Murray, Andy Roddick and John Isner all won their fourth-round matches to reach the quarterfinals. Serena Williams, Caroline Wozniacki, Sam Stosur and Angelique Kerber filled the four spots in the women's semifinals. Because of showers earlier this week, the US Tennis Association extended the tournament, delaying the men's final by 24 hours to Monday. The women's final was shifted from Saturday night to Sunday. No. 2-seeded Nadal beat 68th-ranked Gilles Muller of Luxembourg 7-6 (1), 6-1, 6-2 in Arthur Ashe Stadium. No. 4 Murray eliminated 84th-ranked Donald Young of the United States 6-2, 6-3, 6-3 in the Grandstand, and No. 28 John Isner got past No. 12 Gilles Simon of France 7-6 (2), 3-6, 7-6 (2), 7-6 (4) on Court 17. The 21st-seeded Roddick next faces Nadal with a semifinal berth at stake after completing a rain-delayed 6-3, 6-4, 3-6, 6-3 victory over fifth-seeded David Ferrer of Spain. Murray next plays Isner, who reached the first Grand Slam quarterfinal of his career. In the women's quarterfinals, 13-time major champion Williams overcame some shaky serving early to beat No. 17 Anastasia Pavlyuchenkova of Russia 7-5, 6-1 and improve to 17-0 on hard courts this season. Seeded only 28th after missing nearly a full year because of health problems, Williams hasn't dropped a set so far heading into a semifinal against the top-seeded Wozniacki, a 6-1, 7-6 (5) winner against No. 10 Andrea Petkovic of Germany on Court 13. Next up is Wozniacki's first match against Williams. On the other half of the women's draw, No. 9 Sam Stosur will play 92nd-ranked Angelique Kerber of Germany in the semifinals. Kerber upset No. 26 Flavia Pennetta 6-4, 4-6, 6-3, while Stosur easily defeated No. 2 Vera Zvonareva 6-3, 6-3. Zvonareva was the runner-up at the US Open and Wimbledon last year.
