The announcement came shortly after the Japanese claimed the Australian Open title, which helped her become the first Asian player to be the world's number one, putting an end to Simona Halep's 48-week reign atop the WTA rankings.
"Thank you Naomi. I wish you nothing but the best as well. What a ride that was. Thank you for letting me be part of this," Bajin tweeted in reply.
After helping the Japanese win her maiden Grand Slam singles title at the 2018 US Open, Bajin was awarded the first-ever WTA Coach of the Year title.
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