Osaka posted a tweet on Monday that says she "will no longer be working together with Sascha".
Japan's Naomi Osaka celebrates with the championship trophy during the presentation ceremony after her victory against Czech Republic's Petra Kvitova in the women's singles final on day 13 of the Australian Open.
" Thanks to my team, I don't think I would have made it through this week without you". What a ride that was.
Despite her success alongside Bajin, Osaka confirmed the pair have parted ways on Twitter.