(CNN) -- If this is an indication of what Roger Federer will do at Wimbledon, his opponents had better watch out. Federer recorded the second double bagel of his career when he defeated wildcard Mischa Zverev 6-0 6-0 on Friday to reach the semifinals of a Wimbledon warm-up in Halle, Germany. The only other time Federer didn't drop a game in a match was at the year-end championships in 2005 against clay-court specialist Gaston Gaudio. "You never go to court aiming for such a score," Federer, who turns 32 in August, told reporters. "I'm surprised to have managed it today."
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Roger Federer doesn't lose a game against his quarterfinal opponent
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Federer next meets doubles partner Tommy Haas on the grass in Halle
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Andy Murray reaches the semifinals at Queen's Club event in London
Wimbledon
Wimbledon
At Wimbledon, which begins on June 24, Federer will be bidding to advance to a first grand slam final since claiming a seventh title on the @placeholder grass a year ago.