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Roger Federer of Switzerland, center, his coach Ivan Ljubicic, left, and coach Severin Luethi, right, walk to the court for a training session at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 28, 2018. The Wimbledon Tennis Championships 2018 will be held in London from 2 July to 15 July. (KEYSTONE/Peter Klaunzer)