Andre Agassi was upset by Rainer Schuettler 2-6, 6-2, 6-3 Friday at the Canada Masters in a rematch of the Australian Open final.
Agassi made a series of mistakes from the baseline in the quarterfinal at the hard-court tuneup for the US Open.
The eighth-seeded Schuettler -- who lost to Agassi in straight sets at the year's first Grand Slam tournament -- will play David Nalbandian in the semifinals.
"He made a few mistakes, but I also played really well," said Schuettler, who had been 0-2 against Agassi.
Earlier, Andy Roddick and Roger Federer set up a Wimbledon rematch by winning quarterfinals in straight sets Friday.
Roddick, last year's runner-up, reached the semifinals by beating Karol Kucera 7-6 (5), 6-3, while Federer celebrated his 22nd birthday with a 6-2, 7-6 (3) victory over Max Mirnyi.
After Federer's match, the Wimbledon champion was presented with a birthday cake in the shape of a tennis racket, and the crowd sang "Happy Birthday" in French.
The Swiss star beat Roddick in the semifinals at the All England Club and leads their career series 4-0.
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