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TORONTO — Naomi Osaka retired from her opening match at the National Bank Open due to a back injury. Osaka was trailing Estonia's Kaia Kanepi 7-6 (4), 3-0 when she withdrew from the match. Entering the tournament, Osaka had been eliminated from her last three competitions in the first or second round, including a straight-sets loss to Coco Gauff at last week's Mubadala Silicon Valley Classic. That was her first tournament since the French Open as she recovered from an Achilles injury. The 31st-ranked Kanepi will next play No. 8 Garbine Muguruza of Spain.
