London: A grinning Roger Federer evaded questions about an online video where he appears to perform a `William Tell` trick by hitting a can off the head of a man with his powerful serve.
The YouTube video, posted by Federer`s sponsors Gillette, has gone viral in the past 48 hours with more than a million hits to the official version of the clip.
In the clip, Federer, wearing a business suit, asks a man on the set of an advertisement shoot to put a can on his head and then the ball is shown knocking the can down without harm done.
Asked if the clip showed a real serve, Federer said: "Well, there`s a lot of the debate at the moment. You know how it is with magicians. They don`t tell how their tricks work, you know.”
"I don`t do it that much, but, yeah, it was shot in one piece and it was ... the guy took a chance. It worked out. I`m happy," he said.
Later, when talking about the clip again, Federer said he had "done it before" but was again asked if the clip showed a real action and he said: "Not saying that. A magician doesn`t tell how his tricks work, so ..."
Federer won his second round match at the Cincinnati Masters on Wednesday after his Uzbek opponent Denis Istomin retired with an ankle injury.