Naomi Osaka was on the brink of defeat at the Canadian Open, but she saved two match points to pull off an incredible comeback and win her first match with new coach Tomasz Wiktorowski

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.

So far, the early results are promising for the budding partnership between Osaka and Wiktorowski. Osaka defeated Ariana Arseneault in the first round of the WTA 1000 Montreal yesterday. However, Osaka will face much stiffer competition in the 13-seed Liudmila Samsonova tomorrow. Currently, Osaka is the World No. 49 with a record of 22-11.