World number one Lleyton Hewitt finally ran out of steam and was beaten 6-1 3-6 6-0 by Chilean Fernando Gonzalez in the third round of the Hamburg ATP Masters.

Better news for Mark Philippoussis who upset third-seeded Swiss Roger Federer 6-3 2-6 6-3 to make the quarter-finals.

Hewitt had played six hours of tennis in overcoming his first two opponents and often looked flat against the lively 15th seed.

Hewitt said the long matches in Hamburg meant he was feeling more comfortable on clay with the French Open just 10 days away, but the courts were heavier than those at Roland Garros.

"The French Open is more of a powder kind of surface. I've had decent results here, but I definitely feel I've got better chances at the French Open than here."

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