Roger Federer of Switzerland and Rafael Nadal of Spain play a tennis... Nachrichtenfoto - Getty Images
Roger Federer of Switzerland and Rafael Nadal of Spain play a tennis... Nachrichtenfoto - Getty Images
![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 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](https://c8.alamy.com/comp/2E84A6W/roger-federer-of-switzerland-celebrates-his-winning-of-the-invitational-exhibition-tennis-match-against-pete-sampras-of-the-us-in-seoul-november-20-2007-federer-won-6-4-6-3-reutersjo-yong-hak-south-korea-2E84A6W.jpg)
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 waves to the crowd after defeating Pete Sampras of the U - Photogallery
![Martina Hingis of Switzerland shoots autographed balls to fans after she played an exhibition tennis match with Himari Sato, an 11-year-old Japanese tennis player, at the Pan Pacific Open tennis tournament in Martina Hingis of Switzerland shoots autographed balls to fans after she played an exhibition tennis match with Himari Sato, an 11-year-old Japanese tennis player, at the Pan Pacific Open tennis tournament in](https://c8.alamy.com/comp/2CX8W8D/martina-hingis-of-switzerland-shoots-autographed-balls-to-fans-after-she-played-an-exhibition-tennis-match-with-himari-sato-an-11-year-old-japanese-tennis-player-at-the-pan-pacific-open-tennis-tournament-in-tokyo-september-28-2013-reutersyuya-shino-japan-tags-sport-tennis-2CX8W8D.jpg)
Martina Hingis of Switzerland shoots autographed balls to fans after she played an exhibition tennis match with Himari Sato, an 11-year-old Japanese tennis player, at the Pan Pacific Open tennis tournament in
![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 Stock Photo - Alamy 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 Stock Photo - Alamy](https://c8.alamy.com/comp/2E88M1W/pete-sampras-of-the-us-gestures-during-his-exhibition-tennis-match-against-roger-federer-of-switzerland-in-kuala-lumpur-november-22-2007-reuterszainal-abd-halim-malaysia-2E88M1W.jpg)