Exhibition match - Roger Federer of Switzerland,

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Roger Federer of Switzerland, (R) shakes hands with Pete Sampras of the United States during a press conference for their invitational exhibition tennis match. (AP Photo/ Lee Jin-man)

In This Pic : tennis match, Sampras, Roger Federer, Roger, Pete Sampras, Pete, match, invitational tennis match, invitational exhibition tennis match, Federer, Exhibition match, exhibition, conference

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Pete Sampras of the US speakes during a press conference in Seoul, November 19, 2007. (AFP Photo/Choi Won-Suk)

In This Pic : Sampras, Press Conference, Pete Sampras, Pete, match, Exhibition match, exhibition

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World's number one tennis player Roger Federer speaks during a press conference in Seoul, November 19, 2007. AFP Photo/Choi Won-Suk)

In This Pic : Tennis player, tennis, Roger Federer, Roger, Press Conference, player, match, Federer, Exhibition match, exhibition

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World's number one tennis player Roger Federer (R) and Pete Sampras of the US pose with their hand printings during a press conference in Seoul, November 19, 2007. (AFP Photo/Choi Won-Suk)

In This Pic : Tennis player, tennis, Sampras, Roger Federer, Roger, Press Conference, Players, Pete Sampras, Pete, Federer, Exhibition match

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World's number one tennis player Roger Federer (R) and Pete Sampras of the US pose for a photo during a press conference in Seoul on November 19, 2007. (AFP Photo/Choi Won-Suk)

In This Pic : Tennis player, tennis, Sampras, Roger Federer, Roger, Press Conference, player, Pete Sampras, Pete, Federer, Exhibition match