Four-time Grand Slam champion Naomi Osaka of Japan pulled out of next week’s Pan Pacific Open in Tokyo on Friday because of a back injury.
The former world number one has been sidelined since she retired from her last-16 match at the China Open against eventual champion Coco Gauff at the start of the month.
She then pulled out of this week’s Japan Open in Osaka.
The 27-year-old was set to compete at the Pan Pacific Open as a wild card but…
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