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epa09290315 A Christie's employee poses with Swiss tennis Roger Federer's racket used at the London Olympics 2012 at the Christie's auction house, in London, Britain, 21 June 2021. An online auction of parts of the Swiss tennis player's equipment from various international tennis tournaments will take place from 23 June until 14 July to raise funds for the 'Roger Federer Foundation'. EPA/FACUNDO ARRIZABALAGA