" Thanks to my team, I don't think I would have made it through this week without you". She also thanked Bajin and wished him "all the best in the future".
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. "Thank you for letting me be part of this", he said.
Bajin took up the coach's job with Osaka in 2017 and experienced immediate success.
Osaka is the first player from Asia to grace the top of the women's or men's world tennis rankings.