Naomi Osaka and coach Patrick Mouratoglou are done working together after less than a year, the four-time Grand Slam champion announced Sunday on social media. "Merci Patrick," Osaka began her post, with a photo of her hitting a practice serve while he stands nearby.

Osaka's time with Mouratologou followed an up-and-down sequence of promising signs and frustrations with either injury or close-run defeats.

The Post Maria Sakkari 'massively respects' Naomi Osaka: Not many Slam champs would do that appeared first on Tennis World USA Maria Sakkari is applauding Naomi Osaka's decision to play a WTA 125 (Challenger) tournament and reveals she privately approached the four-time Grand Slam champion to tell her how much she respected her move.

Naomi Osaka is going through tough waters, and fans are thinking she's done. The 27-year-old faced another premature exit at the ongoing Citi DC Open in Washington.