19 of 21: Kim Clijsters of Belgium with partner Tim Henman of Britain plays a return to Steffi Graf of Germany, playing with Andre Agassi of the US as they play a mixed doubles tennis match on Centre Court during a test event on Wimbledon's Centre Court, in London, Sunday, May 17, 2009. Wimbledon's Centre Court has had a moveable roof installed so that play can continue at the grass court championships in wet weather. The Championships begin Monday June 22.

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