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Australian Open 2017: Roger Federer was playing good, aggressive tennis again, says Kei Nishikori-Sports News , Firstpost
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Roger Federer slumps to straight-sets loss against Kei Nishikori at ATP Finals | ATP World Tour Finals | The Guardian
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UNIQLO Launches New Game Wear Models Worn by Global Brand Ambassadors Roger Federer and Kei Nishikori for Wimbledon 2019 - Tennis Connected
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Kei Nishikori's victory against Roger Federer at ATP Finals underlines remarkable comeback | Tennis News | Sky Sports
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