Bajin, the 2018 WTA Coach of the Year, publicly responded, thanking the 21-year-old via his personal Twitter account.
'Hey everyone, I will no longer be working together with Sascha (Bajin),' Osaka tweeted. In response, he thanked her and wished her good luck.
Naomi Osaka, victor of the past two grand slam tournaments, has parted ways with her coach Sascha Bajin.
Bajin became the first recipient of the WTA Coach of the Year award after guiding Osaka through her exponential rise in 2018.
Osaka, who grew up in the US and speaks little Japanese, melted hearts when she fought back tears after her emotional US Open win over her idol Williams as booing echoed around the stadium.
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Osaka secured her first grand slam title at the US Open, beating Serena Williams in a final that was overshadowed by the 23-time major winner's argument with umpire Carlos Ramos.
Under Bajin's guidance Osaka rose from number 72 to the top of the world rankings within a year, taking out back-to-back Grand Slams at the U.S. and Australian Opens. He thanked her and wrote: "I wish you nothing but the best as well".
She was born in Japan - her mother is Japanese, her father is Haitian - and moved to the United States when she was 3.