Former tennis world number one Naomi Osaka is without a coach for the time being. On Wednesday, her previous coach Wim Fissette announced the end of her cooperation with the four-time Grand Slam winner.

“It has been a privilege to coach Naomi since 2019 and to see her grow into the champion she has become,” the 40-year-old Belgian shared via Instagram.

Fissette, who had coached Osaka since 2019, did not say anything about why the split took place. Under his guidance, the 24-year-old won the US Open in 2020 and the Australian Open just a few months later. “She inspired a whole new generation to fall in love with the game and stand up for what you believe in,” Fissette added: “It’s been incredible to be part of that journey.”

However, the big wins are a little further in the past: since her last Grand Slam success to date in Melbourne, Osaka has been on a rollercoaster ride. At the French Open, she did not want to attend the obligatory press conferences and eventually did not appear for her second-round match.

Osaka then spoke publicly about her mental problems and took a break until the Tokyo Olympics. At the French Open this year, she already failed in round one.