「ホップマンカップ」(12月29日~1月5日/オーストラリア・パース/室内ハードコート)

PERTH, AUSTRALIA - JANUARY 01: Serena Williams of the United States and Roger Federer of Switzerland take a selfie on court following their mixed doubles match during day four of the 2019 Hopman Cup at RAC Arena on January 01, 2019 in Perth, Australia. (Photo by Paul Kane/Getty Images)

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