Aryna Sabalenka: Defending champion survives first test as last year's beaten-finalist Qinwen Zheng is shocked

Aryna Sabalenka survives first Australian Open test, while Chinese ace Qinwen Zheng is shocked; Naomi Osaka sets up meeting with fellow mum Belinda Bencic; watch all the action from the ATP and WTA Tours on Sky Sports Tennis and Sky Sports+, NOW and the Sky Sports app