「チャイナ・オープン」(WTAプレミア・マンダトリー/中国・北京/9月29日~10月7日/賞金総額828万5274ドル/ハードコート)

BEIJING, CHINA - OCTOBER 03: Naomi Osaka of Japan and Ballkids pose on day five of 2018 China Open at the China National Tennis Centre on October 3, 2018 in Beijing, China. (Photo by Emmanuel Wong/Getty Images)

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