NEW YORK, Sept 5: For Roger Federer to win his fifth US Open title in a row, the Swiss second seed must prove he still has what it takes to beat Novak Djokovic, this time in a semi-final rematch of last year’s final.

Twelve-time Grand Slam winner Federer and Serbian third seed Djokovic, the reigning Australian Open champion, advanced to a Saturday semi-final replay of their 2007 title showdown with impressive quarter-final triumphs Thursday.

Federer advanced to his 18th consecutive Grand Slam semi-final and stretched his US Open win streak to 32 matches by defeating 130th-ranked qualifier Gilles Muller 7-6 (7/5), 6-4, 7-6 (7/5) to end the Luxembourg left-hander’s dream run.

“I’m happy to keep the semi-final streak alive. That’s a huge streak for a long time,” Federer said. “I’m really happy with my mindset going into the semi-finals. I’m happy to take it to the final four one more time.”

Federer, who last missed a Slam semi-final at the 2004 French Open, has a 6-2 career record against Djokovic, including a 7-6 (7/4), 7-6 (7/2), 6-4 victory in last year’s final.

“He’s an absolute favorite in that match,” Djokovic said. “I lost to him last year. For him it’s a big challenge to go back to number one. For sure it’s going to be a great match.”

Djokovic eliminated US eighth seed Andy Roddick 6-2, 6-3, 3-6, 7-6 (7/5) in Thursday’s other Arthur Ashe Stadium quarter-final, the Serbian spurred on by Roddick’s jokes to the crowd two nights earlier about Djokovic claiming several injuries.

It will be the first healthy meeting of Federer and Djokovic since last year at Flushing Meadows.

Djokovic beat Federer in straight sets in the Australian Open semi-finals on the way to his first Slam title, but Federer said he was ill, and Djokovic retired against Federer in an April semi-final on Monte Carlo clay.

Saturday’s other semi-final will send British sixth seed Andy Murray against Spanish world number one Rafael Nadal, who seeks his third Slam crown in a row after beating Federer in the French Open and Wimbledon finals.

Federer won the only break of the match in the ninth game of the second set on a forehand winner. Muller denied Federer on three break points in the third set on the way to a tie-break, then grabbed a 4-1 edge before Federer rallied.

Muller, who twice rallied to win here after losing the first two sets, upset Russian fifth seed Nikolay Davydenko in the fourth round to become the second qualifier in the US Open final eight after France’s Nicolas Escude in 1999.

“A lot of people think I should be happy but I’m disappointed because I feel like I had my chances and I didn’t take advantage of them,” Muller said.

Djokovic made the most of his chances to down Roddick, who was two points from forcing a fifth set until he double faulted twice to give the Serbian his only break point of the set, which Djokovic converted on a backhand lob winner.

Each man held once more to set up the tie-breaker, which went to 5-5 before Roddick netted a backhand volley to give Djokovic match point. The Serbian smacked a service winner and Roddick wass done after two hours and 34 minutes.

Djokovic broke Roddick in four of his first eight service games, providing the margin for claiming the first two sets, but Roddick held serve his next nine chances to set up the fourth-set drama.

Roddick’s fifth loss in seven US Open quarter-finals ensured American men would equal their longest Slam title drought at 21 events, matching a five-year hex that the late Arthur Ashe ended by winning the 1968 Wimbledon title.

Results:

Men’s singles quarter-finals:

3-Novak Djokovic (Serbia) bt 8-Andy Roddick (US) 6-2, 6-3, 3-6, 7-6 (5). 2-Roger Federer (Switzerland) bt Gilles Muller (Luxembourg) 7-6(5), 6-4, 7-6(5).

—Reuters/AFP