The world No 1 will play her first tournament since her success in Melbourne at the WTA Dubai Duty Free Tennis Championships next year and it will be her first without Bajin in her corner.
'Hey everyone, I will no longer be working together with Sascha (Bajin),' Osaka tweeted. I wish you nothing but the best as well.
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Asked whether the comments reflect Government policy, Brexit Secretary Stephen Barclay told BBC Radio 4's Today programme: 'No. A disruption to global trade could reduce activity and the supply capacity of economies.
Naomi Osaka surprisingly split from coach Sascha Bajin, a little more than two weeks after she won the Australian Open for a second consecutive Grand Slam title and moved to No. 1 in the WTA rankings.
Bajin replied to Osaka with a tweet of his own.
'I wish you nothing but the best as well, ' he responded. Osaka's Twitter feed lit up in response to her announcement, with several memes expressing widespread disbelief - including a shrugging Barack Obama, a confused Joey from American sitcom "Friends" and a Minions character screaming "WHAAAAT?"