In this file photo taken on January 26, 2019, Sascha Bajin (front 2nd left), coach of Japan's Naomi Osaka, watches Osaka play against Czech Republic's Petra Kvitova during the women's singles final on day 13 of the Australian Open tennis tournament in Melbourne.
Bajin had suggested that he was in for the "long haul" with Osaka in an interview late a year ago, but no explanation has yet been given for the decision for the pair to split.
'I thank him for his work and wish him all the best in the future'.
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No replacement coach has been named by Osaka who is scheduled to resume her season next week in Dubai.
The 21-year-old made the announcement on Monday on her Twitter handle and thanked Bajin for his work. "What a ride that was. Thank you for letting me be part of this", Bajin responded.
The Japanese star beat red-hot favourite Serena Williams in straight sets to claim her maiden grand slam title last September at the US Open.
Osaka is the first player from Asia to grace the top of the women's or men's world tennis rankings. She has dual citizenship and now is based in Florida.