Roger Federer reaches semifinals of Gerry Weber Open

Second-seeded Roger Federer moved into the semifinals of the Gerry Weber Open when his quarter-final opponent was forced to withdrew from the tournament on Thursday.

Back problems prevent Lu Yen-hsun from playing quarter-final match

Roger Federer advanced to the Gerry Weber Open semifinals when his quarter-final opponent withdrew with back problems. (Thomas Starke/Getty Images)

Roger Federer progressed to the semifinals of the grass-court Gerry Weber Open without playing after Lu Yen-hsun of Taiwan pulled out of their quarter-final with back problems in Halle, Germany, on Friday.

Federer, who began his preparations for Wimbledon by defeating Portugal's Joao Sousa on Thursday, compensated by playing an exhibition against Christopher Kas, a German player who is 78th in the doubles rankings.

The seven-time Wimbledon winner next faces the fourth-seeded Kei Nishikori of Japan, who saved the five break points he faced in a 6-1, 7-6 (4) victory over Steve Johnson of the United States.

Former champion Philipp Kohlschreiber booked his semifinal place with a hard-fought 6-4, 5-7, 7-6 (16) victory over German compatriot Dustin Brown. Brown ousted top-ranked Rafael Nadal of Spain on Thursday.

Kohlschreiber recovered from a 2-5 deficit in the tiebreaker before claiming the win in two hours 10 minutes.

"I don't think a third set ever went so long," the 2011 tournament winner said. "Absolute war of nerves.

"The atmosphere was incredible. But in the end, you just want to leave the court as the winner." 

Kohlschreiber will next face Alejandro Falla of Colombia, who defeated German wild-card entry Peter Gojowczyk 7-6 (4), 7-6 (2). Gojowczyk upset the third-seeded Milos Raonic of Thornhill, Ont., in the second round.

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