By DPA
London : Tommy Haas of Germany withdrew from Wimbledon with a torn stomach muscle Sunday, giving 2003-2006 champion Roger Federer a walkover and a place in the quarterfinals.
Haas was due to play world number one Federer in a showcase fourth-round match Monday.
But the number 13 seed from Germany was unable to play because of the injury, which had already plagued him in his third-round win against Russian Dmitry Tursunov.
It is the latest injury blow for Haas, who only returned to action at Wimbledon from a shoulder injury, which sidelined him for almost two months.
In the quarterfinals, Federer will play either former French Open champion Juan Carlos Ferrero of Spain or Serbia's Janko Tipsarevic.
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