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: Casper Ruud of Team Norway celebrates defeating John Isner of Team USA during day one of the 2020 ATP Cup Group Stage at RAC Arena on January 03, 2020 in Perth, Australia. (Photo by Paul Kane/Getty Images)

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