The top-ranked player, who split from Tony Roche after four straight tournaments without a title, said today he wouldn't be hiring another coach in the near future.

"I'm definitely not going to take a coach for the French Open and Wimbledon because I know what it takes and I don't want anybody interfering with my preparation and with my tournaments," Federer said at the Hamburg Masters, where he has a first-round bye.

"Maybe down the road I'm going to look again for someone who's going to be able to help me out for practicing," he said.

Federer's worst slump since he became the top-ranked player in 2004 culminated with a straight-set loss to Italian wild card Filippo Volandri in the third round of the Rome Masters last week. But Federer insisted the defeat was not the reason for his split from Roche.

"It's something that's been inside myself for a few months," Federer said. "It was a decision that wasn't easy, of course, because we're good friends and get along very well and he's helped me a lot over the last couple of years.

"(But) in the end he was a part-time coach. We only were together for 15 weeks and distances were also not so easy ... I just thought the communication kind of changed and it was not going much further."

Federer, who needs to win the French Open to complete a career Grand Slam, said his recent losses did not worry him.

"In Monaco, I reached the finals," Federer said. "I'm very happy the way I played there from the quarters on. Last week was obviously disappointing, and I wasn't happy with my performance there.