World number one Naomi Osaka has ended her partnership with coach Sascha Bajin.
The 21-year-old made the announcement on Monday on her Twitter handle and thanked Bajin for his work.
"Hey everyone, I will no longer be working together with Sascha. I thank him for his work and wish him all the best in the future," she wrote.
Hey everyone, I will no longer be working together with Sascha. I thank him for his work and wish him all the best in the future.— NaomiOsaka大坂なおみ (@Naomi_Osaka_) February 11, 2019
Bajin took up the coach's job with Osaka in 2017 and experienced immediate success. Osaka won her first WTA title at the BNP Paribas Open, last March, following which she went on to clinch 2018 US Open title and 2019 Australian Open.
During the off-season, Bajin was awarded the WTA Coach of the Year award. Before associating with Osaka, Bajin served as the primary hitting partner for former world number one Serena Williams and as a hitting partner for Caroline Wozniacki, Sloane Stephens and Victoria Azarenka, WTA reported.
Osaka will next appear in Dubai Duty Free Tennis Championships, beginning next week.