Serbia's Novak Djokovic in action Switzerland's Roger Federer during the ATP World Tour Finals at the O2 Arena, London Stock Photo - Alamy
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:focal(1009x215:1011x213)/origin-imgresizer.eurosport.com/2015/11/17/1734331-36684846-2560-1440.jpg "Federer ends Djokovic's three-year winning streak at ATP World Tour Finals - Eurosport")
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Serbia's Novak Djokovic celebrates beating Switzerland's Roger Federer in their final tennis match at the ATP World Tour Finals at the O2 Arena in London November 12, 2012. Djokovic cemented his place
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