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epa01733881 Tennis player Steffi Graf returns a ball during her exhibition game against Kim Clijsters in the Centre Court of Wimbledon, London, Britain, 17 May 2009. The Centre Court inaugurates his new retractable roof in order to prevent rain interrupting showpiece matches at future championships. The moving translucent roof covers 5200sqm, weighs 1000 tonnes and allows to continue a game in a period of 20 minutes. (KEYSTONE/EPA/FELIPE TRUEBA)