Belgium's Kim Clijsters (R) smiles with partner Tim Henman during their mixed doubles match against Steffi Graf and Andre Agassi under the newly completed Centre Court roof at Wimbledon in London May 17, 2009.

Belgium's Kim Clijsters (R) smiles with partner Tim Henman during their mixed doubles match against Steffi Graf and Andre Agassi under the newly completed Centre Court roof at Wimbledon in London May 17, 2009.

Belgium's Kim Clijsters (L) smiles with partner Tim Henman during their mixed doubles match against Steffi Graf and Andre Agassi under the newly completed Centre Court roof at Wimbledon in London May 17, 2009.

Belgium's Kim Clijsters (R) smiles with partner Tim Henman during their mixed doubles match against Steffi Graf and Andre Agassi under the newly completed Centre Court roof at Wimbledon in London May 17, 2009.

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LONDON, ENGLAND - MAY 17: A general view of the closed centre court roof during the Mixed Doubles match of Andre Agassi and Steffi Graf against Tim Henman and Kim Clijsters during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: L-R - Andre Agassi, Steffi Graf, Kim Clijsters and Tim Henman pose with commemorative trophies following the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: L-R - Andre Agassi, Steffi Graf, Kim Clijsters and Tim Henman pose with commemorative trophies following the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: Kim Clijsters and Tim Henman pose with commemorative trophies following the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: Kim Clijsters and Tim Henman pose with commemorative trophies following the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: Kim Clijsters and Tim Henman pose with commemorative trophies following the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: Tim Henman (L), Kim Clijsters (2nd L), Steffi Graf (2nd R) and Andre Agassi (R) pose for photographs prior to Mixed Doubles match during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: Tim Henman and Kim Clijsters chat during the Mixed Doubles match against Andre Agassi and Steffi Graf during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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American tennis player Andre Agassi returns a ball in his gentleman's singles match on centre court against English tennis player Tim Henman during the launch of the new retractable roof on centre court at Wimbledon's All England Lawn Tennis Club in Wimbledon on May 17, 2009.

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American tennis player Andre Agassi waves to the crowd after winning his gentleman's singles match on centre court against English tennis player Tim Henman during the launch of the new retractable roof on centre court at Wimbledon's All England Lawn Tennis Club in Wimbledon on May 17, 2...

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American tennis player Andre Agassi reaches for a ball in his gentleman's singles match on centre court against English tennis player Tim Henman during the launch of the new retractable roof on centre court at Wimbledon's All England Lawn Tennis Club in Wimbledon on May 17, 2009.

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Former tennis champion Andre Agassi of the US, seen in action, during his mixed double tennis match with his wife, former tennis champion, German born Steffi Graf, against British tennis player Tim Henman and former tennis champion Kim Clijsters, from Belgian, during a test event on Wim...

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LONDON, ENGLAND - MAY 17: Andre Agassi apologises after hitting Kim Clijsters (L) with a shot during the Mixed Doubles match of Andre Agassi and Steffi Graf against Tim Henman and Kim Clijsters during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: Kim Clijsters reacts after being hit by a shot from Andre Agassi during the Mixed Doubles match of Andre Agassi and Steffi Graf against Tim Henman and Kim Clijsters during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

Andre Agassi of the U.S. and Germany's Steffi Graf kiss during their mixed doubles match against Tim Henman and Kim Clijsters under the newly completed Centre Court roof at Wimbledon in London May 17, 2009.

Andre Agassi of the U.S (L), Steffi Graf of Germany (2nd L), Kim Clijsters of Belgium (2nd R), and Tim Henman of Britain in action during their mixed doubles match under the newly completed Centre Court roof at Wimbledon in London May 17, 2009.

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LONDON, ENGLAND - MAY 17: A general view of the action during the Mens Singles match between Andre Agassi and Tim Henman during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: A general view of the action during the Mens Singles match between Andre Agassi and Tim Henman during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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LONDON, ENGLAND - MAY 17: A general view of the action during the Mens Singles match between Andre Agassi and Tim Henman during the 'Centre Court Celebration' at Wimbledon on May 17, 2009 in London, England.

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Andre Aggassi reacts during his exhibition mixed doubles match against Tim Henman and Kim Clijsters to mark the launch of the new retractable roof on Centre Court at the All England Lawn Tennis Club, Wimbledon, England, on May 17, 2009.

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Andre Aggassi (R) and Steffi Graf (L) are pictured in action during thetr exhibition mixed doubles match against Kim Clijsters and Tim Henman to mark the launch of the new retractable roof on Centre Court at the All England Lawn Tennis Club, Wimbledon, England, on May 17, 2009.