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Former tennis champion Andre Agassi of the US, left, kisses his wife former tennis champion, German born Steffi Graf, on Center Court as they prepare to play former British tennis player Tim Henman and former tennis champion Kim Clijsters, from Belgian, in a mixed doubles tennis match 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. (KEYSTONE/AP Photo/Alastair Grant)