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Switzerland's
Roger Federer celebrates his victory against Japan's Kei Nishikori during their
fourth round match at the Australian Open in Melbourne on January 22, 2017 ©Saeed
Khan (AFP)
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Swiss 17-time Grand Slam
champion Roger Federer advanced to the quarter-finals of the Australian Open
with a gruelling five-set victory over Japan's Kei Nishikori on Sunday.
