- Roger Federer to face top seed Novak Djokovic in U.S. Open semis
- Federer blows away Jo-Wilfried Tsonga in straight sets
- Djokovic beats Janko Tipsarevic after fellow Serbian retires
- Rafael Nadal faces Andy Roddick in quarters on Friday
Roger Federer was back to his imperious best to brush aside the challenge of Jo-Wilfried Tsonga and book a U.S. Open semifinal clash with world number one Novak Djokovic.
Federer, a five-time champion in New York, gained revenge for a run of two successive defeats to the Frenchman -- at Wimbledon and in Montreal -- to record a 6-4 6-3 6-3 victory.
He will now face Djokovic in the final four on Saturday after the Serbian edged past fellow countryman Janko Tipsarevic, who retired in the fourth set.
Tipsarevic took the game to his practice partner and had just leveled the match at one set all when he became hampered by injury. He eventually threw in the towel with the score at 7-6 6-7 6-0 3-0.
"I played great," Federer told reporters. "For me it continues, and that is awesome. I'm very happy with the way I'm playing, the way I'm moving and I'm enjoying myself on the court."
Of his clash with Djokovic he added: "It's always a great match-up between the two of us. We've played over 20 times, I think, so there is no real secrets out there.
"We have had particularly good matches here at the U.S. Open and I have the feeling it's going to be something similar again."
Federer and Djokovic now have a day off to prepare for their semifinal while the other half of the draw that includes Rafael Nadal and Andy Murray must complete their quarterfinals on Friday.
Heavy rain meant play was suspended on Tuesday and Wednesday and as a result of the havoc caused to the schedule, the United States Tennis Association responded to criticism from the players by confirming the men's final would be held on Monday.
Nadal, from Spain, made light work of his match with Giles Muller, winning 7-6 6-1 6-2 to book his semifinal date with Andy Roddick.
"It was a tough day yesterday for the players and the fans who waited many hours. Sorry about that, but thanks for still being here," Nadal said in a court side interview.
"After the last two days, I am happy to be through. I played well against a very tough player. The situation yesterday was not easy for us and the organizers. They tried their best but they were wrong. Everyone makes mistakes."
Roddick beat fifth seed David Ferrer on Court 13 after both players insisted their match be moved from the Louis Armstrong Stadium as it was still too dangerous to play on.
Officials used towels, duct tape and even a hoover to try and remove underlying water on the court but Roddick reacted angrily to being brought back out to play without the problem being solved.
There were no such problems on the Grandstand as Andy Murray beat American wild card Donald Young 6-2 6-3 6-3.
The British number four seed will now face American John Isner in the quarters after he beat Gilles Simon 7-6 3-6 7-6 7-6.