(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."

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 Wimbledon grass a year ago.

He lost to Tomas Berdych in the U.S. Open quarterfinals last September, Andy Murray in January's Australian Open semifinals and Jo-Wilfried Tsonga in this month's French Open quarterfinals.

Federer knows the chances of registering a second consecutive double bagel are slim. He meets local favorite and the man who beat him in last year's final in Halle, Tommy Haas, in the last four.

"I expect a completely different opponent tomorrow," Federer said.

Haas and Federer, good friends, played doubles together this week in Halle.

"He is one of the greatest of all time, perhaps the greatest," said Haas.

Haas, the 35-year-old third seed, rallied from a set down to oust Gael Monfils 6-7 (4) 6-3 6-3.

But he was the only German winner on the day. Besides Zverev, sixth-seed Philipp Kohlschreiber and eighth-seed Florian Mayer were also sent packing.

Answer this series of questions:

1. What sport is being played?
2. Which competition?
3. Who is the player?
4. How old is he?
5. When does Wimbledon start?
6. What is he hoping to achieve?
7. Who beat him at the quarterfinals?
8. In what month?
9. And who beat him in the Australian?
10. In what month?
11. Who beat him in the French Open?

Numbered answers:
1. tennis
2. Wimbledon warm-up
3. Roger Federer
4. he turns 32 in August,
5. June 24
6. a grand slam
7. Tomas Berdych
8. September
9. Andy Murray
10. January
11. Jo-Wilfried Tsonga