Former tennis player Pete Sampras and his wife, actress Bridgette Wilson, attend the light heavyweight fight between Bernard Hopkins of the U.S. and Joe Calzaghe of Wales at the Thomas & Mack Center in Las Vegas, Nevada April 19, 2008. REUTERS/Steve Marcus (UNITED STATES) 

Tennis player Pete Sampras attends a light-heavyweight fight between Bernard Hopkins and Joe Calzaghe of Wales at the Thomas & Mack Center in Las Vegas, Nevada April 19, 2008. REUTERS/Steve Marcus (UNITED STATES) 

Roger Federer of Switzerland hits a return to Pete Sampras of the U.S. during their exhibition tennis match at New York's Madison Square Garden March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Pete Sampras of the U.S. reacts to a lost point during the third set tie-break during his exhibition tennis match against Roger Federer of Switzerland at New York's Madison Square Garden, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

Pete Sampras of the U.S. lunges for a shot during his exhibition tennis match against Roger Federer of Switzerland at New York's Madison Square Garden, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

Roger Federer of Switzerland serves to Pete Sampras of the U.S. during their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Tiger Woods (R) and his wife Elin Nordegren laugh as they watch Roger Federer of Switzerland play Pete Sampras of the U.S. during their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Pete Sampras of the U.S. plays to the crowd during his exhibition tennis match against Roger Federer of Switzerland at New York's Madison Square Garden, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

Roger Federer (L) of Switzerland serves to Pete Sampras of the U.S. during their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

Pete Sampras of the U.S. reacts as he sits in his chair after losing to Roger Federer of Switzerland in an exhibition tennis match at New York's Madison Square Garden, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

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, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

Roger Federer (R, on court) of Switzerland plays Pete Sampras of the U.S. in their exhibition tennis match in front of a sold-out Madison Square Garden in New York, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

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. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

Roger Federer (R) of Switzerland is congratulated by Pete Sampras of the U.S. at the conclusion of their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. Federer won the match 6-3, 6-7, 7-6. REUTERS/Mike Segar (UNITED STATES) 

Roger Federer of Switzerland stands in a spotlight as he is introduced prior to his exhibition tennis match against Pete Sampras of the U.S. at New York's Madison Square Garden, March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Roger Federer of Switzerland serves to Pete Sampras of the U.S. during their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Roger Federer of Switzerland hits a return to Pete Sampras of the U.S. during their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Pete Sampras of the U.S. hits a return to Roger Federer of Switzerland during the first set of their exhibition tennis match at New York's Madison Square Garden, March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Pete Sampras of the U.S. serves to Roger Federer of Switzerland during the first set of their exhibition match at New York's Madison Square Garden, March 10, 2008. REUTERS/Mike Segar (UNITED STATES) 

Switzerland's Roger Federer returns a shot to Pete Sampras of the U.S. during an exhibition tennis match in Macau November 24, 2007. REUTERS/Dennis Ho (CHINA) 

U.S. Pete Sampras takes a break during an exhibition tennis match against Switzerlands Roger Federer in Macau on November 24,2007. REUTERS/Dennis Ho (CHINA) 

Switzerland's Roger Federer reacts during an exhibition tennis match against Pete Sampras of the U.S. in Macau November 24, 2007. REUTERS/Dennis Ho (CHINA) 

Pete Sampras of the U.S. waves during an exhibition tennis match against Switzerland's Roger Federer in Macau on November 24,2007. REUTERS/Dennis Ho (CHINA) 

U.S. Pete Sampras sits during an exhibition tennis match against Switzerlands Roger Federer in Macau on November 24,2007. REUTERS/Dennis Ho (CHINA) 

Pete Sampras of the U.S. returns a shot to Switzerland's Roger Federer during an exhibition tennis match in Macau November 24, 2007. REUTERS/Dennis Ho (CHINA) 

Switzerland's Roger Federer serves to Pete Sampras of the U.S. during an exhibition tennis match in Macau November 24, 2007. REUTERS/Dennis Ho (CHINA) 

Switzerland's Roger Federer returns a shot to Pete Sampras of the U.S. during an exhibition tennis match in Macau November 24, 2007. REUTERS/Dennis Ho (CHINA) 

Pete Sampras of the U.S. (R) chats with Switzerland's Roger Federer during their friendly match in Macau November 24,2007. REUTERS/Dennis Ho (CHINA) 

Switzerland's Roger Federer signs autographs for his fans after his friendly match against Pete Sampras of the U.S. in Macau November 24,2007. REUTERS/Dennis Ho (CHINA) 

Switzerland's Roger Federer (R) and Pete Sampras of the U.S. celebrate after their friendly match in Macau November 24,2007. Sampras won 7-6, 6-4. REUTERS/Dennis Ho (CHINA) 

Roger Federer of Switzerland (L) and Pete Sampras of the U.S. ride a gondola in Macau, November 23, 2007. Federer and Sampras will play a friendly match on November 24. REUTERS/Dennis Ho (CHINA) 

Roger Federer of Switzerland (R) and Pete Sampras of the U.S. ride a gondola in Macau November 23, 2007. Federer and Sampras will play a friendly match on November 24. REUTERS/Dennis Ho 

Roger Federer of Switzerland (R) and Pete Sampras of the U.S. gesture as they ride a gondola in Macau November 23, 2007. Federer and Sampras will play a friendly match on November 24. REUTERS/Dennis Ho (CHINA) 

Roger Federer (L) of Switzerland waves as he enters the court for his match against Pete Sampras of the U.S. during a tennis invitational exhibition match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer (R) of Switzerland poses with Pete Sampras of U.S. after their tennis invitational exhibition match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Pete Sampras of the U.S. gestures during his exhibition tennis match against Roger Federer of Switzerland in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Pete Sampras of the U.S. plays a shot to Roger Federer of Switzerland during their exhibition tennis match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer (R) of Switzerland plays a shot to Pete Sampras of the U.S. during their exhibition tennis match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer of Switzerland throws the ball to Pete Sampras of the U.S. during their tennis invitational exhibition match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer (L) of Switzerland waves as he enters the court for an invitational exhibition tennis match against Pete Sampras of the U.S.in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer of Switzerland gestures after winning the match against Pete Sampras of the U.S. during invitational exhibition tennis match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer (R) of Switzerland and Pete Sampras (2nd L) of the U.S. pose with Malaysia's King Tuanku Mizan Zainal Abidin (2nd R) and Malaysia Deputy Prime Minister Najib Razak after their invitational exhibition tennis match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer (R) of Switzerland talks to Malaysia's King Tuanku Mizan Zainal Abidin (C) as Pete Sampras of the U.S. looks on after their invitational exhibition tennis match in Kuala Lumpur November 22, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer of Switzerland arrives at a hotel in Kuala Lumpur November 21, 2007. Federer will play Pete Sampras of the U.S. in an invitational exhibition match on Thursday. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer (R) of Switzerland shakes hands with Pete Sampras of the U.S. during a news conference ahead of an invitational exhibition match in Kuala Lumpur November 21, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Pete Sampras of the U.S. (L) talks to Roger Federer of Switzerland during a news conference ahead of an invitational exhibition match in Kuala Lumpur November 21, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer (R) of Switzerland and Pete Sampras of the U.S. pose during a news conference ahead of an invitational exhibition match in Kuala Lumpur November 21, 2007. REUTERS/Zainal Abd Halim (MALAYSIA) 

Roger Federer of Switzerland (L) talks with Pete Sampras of the U.S. before their invitational exhibition tennis match in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland returns a ball during an invitational exhibition tennis match against Pete Sampras of the U.S. in Seoul November 20, 2007. Federer won the match. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland serves during an invitational exhibition tennis match against Pete Sampras of the U.S. in Seoul November 20, 2007. Federer won the match. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland gestures during an invitational exhibition tennis match against Pete Sampras of the U.S. in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Pete Sampras of the U.S. walks during an invitational exhibition tennis match against Roger Federer of Switzerland in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Pete Sampras of the U.S. drinks water during an invitational exhibition tennis match against Roger Federer of Switzerland in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Pete Sampras of the U.S. returns a ball during an invitational exhibition tennis match against Roger Federer of Switzerland in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland celebrates his winning of the invitational exhibition tennis match against Pete Sampras of the U.S. in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland (R) talks with Pete Sampras of the U.S. after their invitational exhibition tennis match in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland celebrates his winning of the invitational exhibition tennis match against Pete Sampras of the U.S. in Seoul November 20, 2007. Federer won 6-4, 6-3. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland (R) and Pete Sampras of the U.S. hold hands after their invitational exhibition tennis match in Seoul November 20, 2007. Federer won the match. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland (R) and Pete Sampras of the U.S., wearing traditional Korean clothes, shake hands after their invitational exhibition tennis match in Seoul November 20, 2007. Federer won the match. REUTERS/Jo Yong-Hak (SOUTH KOREA) 

Roger Federer of Switzerland (L) and Pete Sampras of the U.S., wearing traditional Korean clothes, walk after their invitational exhibition tennis match in Seoul November 20, 2007. REUTERS/Jo Yong-Hak (SOUTH KOREA)