Roger Federer progressed to the semi-finals of the grass-court Gerry Weber Open without playing after Lu Yen-hsun of Taiwan pulled out of their quarter-final with back problems 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 American Steve Johnson.
Former champion Philipp Kohlschreiber booked his semi-final place with a hard-fought 6-4, 5-7, 7-6 (16) victory over German compatriot Dustin Brown. Brown ousted top-ranked Rafael Nadal on Thursday.
Kohlschreiber recovered from a 2-5 deficit in the tiebreaker before claiming the win in 2 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 Peter Gojowczyk 7-6 (4), 7-6 (2). Gojowczyk upset the third-seeded Milos Raonic in the second round.
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