Pictures of the Year 2009: Germany's Steffi Graf (L) reacts after Andre Agassi of the U.S. accidentally hit Belgium's Kim Clijsters

Germany's Steffi Graf (L) reacts after Andre Agassi of the U.S. accidentally hit Belgium's Kim Clijsters (C) with the ball during their mixed doubles match under the newly completed Centre Court roof at Wimbledon in London May 17, 2009.
Credit: REUTERS/Kieran Doherty