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MELBOURNE, Australia — The reigning United States Open champion, Naomi Osaka, was serving to extend her third-round match against Hsieh Su-Wei when she rolled her right foot while running for a ball and tumbled to the ground, prompting the chair umpire to ask if she was O.K.
“No,” Osaka replied, but she was laughing.
Osaka, 21, who was born in Japan and is based in Florida, had already squared herself once, picking her game up after dropping the first set and falling behind 2-4, 0-40 in the second against Taiwan’s Hsieh, a big-seed slayer with a bedeviling slice.