Naomi Osaka has parted company with coach Patrick Mouratoglou less than a year after the pair began working together, the four-times Grand Slam champion said days after her defeat to Emma Raducanu at the Washington Open.

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.

Naomi Osaka, currently participating at the WTA 1000 event of the 2025 National Bank Open in Montreal, has roped in Iga Swiatek's ex-coach Tomasz Wiktorowski on a trial basis.