Retractable roof

TennisSportsWimbledon ChampionshipsKim ClijstersTim HenmanAndre AgassiSteffi Graf
Former tennis champion Andre Agassi, and his wife, former tennis champion, German born Steffi Graf, are seen during their mixed double tennis match against British tennis player Tim Henman and former tennis champion Kim Clijsters, from Belgian, during a test event on Wimbledon's Centre Court,... AP photo by Neal Simpson
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