Naomi Osaka is reshuffling her coaching team, parting ways with Patrick Mouratoglou and eyeing a fresh start with coach Tomasz Wiktorowski. The four-time Grand Slam champion announced the split from Mouratoglou on Sunday, just ahead of a trial collaboration with Wiktorowski at the Omnium Banque Nationale in Montreal.

“Merci, Patrick,” she wrote in an Instagram story. “It was such a great experience learning from you. Wishing you nothing but the best. You’re one of the coolest people I’ve ever met and I’m sure I’ll see you around.