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Roger Federer Trick Shot a YouTube Hit

Incredible feat of athletic prowess or incredible feat of video trickery?

A video showing Roger Federer knocking a metal can off a guy's head with a serve has become a YouTube sensation. The video was made during filming for a Gillette ad.

Of course, there are questions as to whether it's genuine or just the latest example of slick editing or computer-generated imaging. Speaking after his opening match at the Cincinnati Masters, Federer was coy on the topic, telling the Associated Press that "a magician doesn't tell how his tricks work."

Here's the clip: