TENNIS PHOTOS

  • Japan's Kei Nishikori wipes his face while playing Switzerland's Roger Federer during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 22, 2017. (AP Photo/Andy Brownbill)

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  • MELBOURNE, AUSTRALIA - JANUARY 22: Kei Nishikori of Japan celebrates a point in his fourth round match against Roger Federer of Switzerland on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

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  • MELBOURNE, AUSTRALIA - JANUARY 22: Roger Federer of Switzerland wins the third set in his fourth round match against Kei Nishikori of Japan on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

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  • MELBOURNE, AUSTRALIA - JANUARY 22: Kei Nishikori of Japan reacts in his fourth round match against Roger Federer of Switzerland on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

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  • Japan's Kei Nishikori reacts during play against Switzerland's Roger Federer during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 22, 2017. (AP Photo/Dita Alangkara)

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  • MELBOURNE, AUSTRALIA - JANUARY 22: Kei Nishikori of Japan reacts in his fourth round match against Roger Federer of Switzerland on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

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  • Japan's Kei Nishikori sticks his tongue out while playing Switzerland's Roger Federer during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 22, 2017. (AP Photo/Andy Brownbill)

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  • Japan's Kei Nishikori reaches to play a forehand to Switzerland's Roger Federer during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 22, 2017. (AP Photo/Andy Brownbill)

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  • Mirka, bottom second right, wife of Switzerland's Roger Federer, yells out during his fourth round match against Japan's Kei Nishikori at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 22, 2017. (AP Photo/Andy Brownbill)

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  • MELBOURNE, AUSTRALIA - JANUARY 22: Kei Nishikori of Japan plays a backhand in his fourth round match against Roger Federer of Switzerland on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

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