世界テニス国別対抗戦「ATPカップ」(オーストラリア・ブリスベン、パース、シドニー/1月3~12日/賞金総額1500万ドル/ハードコート)

PERTH, AUSTRALIA - JANUARY 03: John Isner of USA reacts after dropping a point in the mens singles match against Casper Ruud of Norway during day one of the 2020 ATP Cup Group Stage at RAC Arena on January 03, 2020 in Perth, Australia. (Photo by Will Russell/Getty Images)

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