Naomi Osaka was trailing Estonia's Kaia Kanepi 7-6 (4), 3-0 when she withdrew from her opening match Tuesday at the National Bank Open due to a back injury.
Naomi Osaka was trailing Estonia's Kaia Kanepi 7-6 (4), 3-0 when she withdrew from her opening match Tuesday at the National Bank Open due to a back injury.
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