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England, London, June 29, 2015, Tennis, Wimbledon, practisecourts, Robin Haase (NED) and his coach Mark de Jong Photo: Tennisima Stock Photo - Alamy
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Australia's Mark Philippoussis (L) practices watched by unidentified coach before his men's singles final match against Switzerland's Roger Federer at the Wimbledon Tennis Championships in London, July 6, 2003. REUTERS/Jeff J Mitchell
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