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Pete Sampras (L) and Roger Federer of Switzerland pose prior to their exhibition match. (AFP Photo/Nick Laham)Read More

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Pete Sampras hits a backhand volley to Roger Federer of Switzerland during their exhibition match on March 10, 2008 at Madison Square Garden in New York City. (AFP Photo/Nick Laham)Read More

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Roger Federer, of Switzerland, returns to Peter Sampras during the third set of their exhibition tennis match at Madison Square Garden in New York on Monday, March 10, 2008. (AP Photo/Ed Betz)Read More

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Pete Sampras of the U.S. reacts to a lost point during his exhibition match against Roger Federer of Switzerland at New York's Madison Square Garden on March 10, 2008. (Reuters/Mike Segar)Read More

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Roger Federer of Switzerland waves to the crowd after defeating Pete Sampras of the U.S. in their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. (Reuters/Mike Segar)Read More