Naomi Osaka apologises for "disrespecting" Sorana Cirstea after receiving a frosty handshake from the Romanian after their Australian Open second-round match.

Naomi Osaka apologises for "disrespecting" Sorana Cirstea after receiving a frosty handshake from the Romanian after their Australian Open second-round match.

Naomi Osaka was a 6-3, 4-6, 6-2 winner over Sorana Cirstea but tempers frayed at the end of the match