Teenage qualifier Learner Tien stunned last year's Australian Open runner-up Daniil Medvedev after Jannik Sinner roared back to take his place in the third round.
Last year's runner-up Daniil Medvedev was dumped out in the Australian Open second round early Friday morning by 19-year-old qualifier Learner Tien in a massive Melbourne shock
World No. 2 Iga Swiatek will face a tricky third round tie against Britain's Emma Raducanu.
Roared on by Brazilian fans decked out in yellow, Joao Fonseca appeared totally unfazed as he set up a second-round meeting with Italy's Lorenzo Sonego.
A volatile Daniil Medvedev mangled his racquet in an epic temper tantrum on Tuesday before battling through a five-set roller coaster to stay alive at the Australian Open
Three-time losing finalist Daniil Medvedev and home favourite Alex de Minaur set out on the road to Australian Open glory Tuesday
Medvedev, who lifted the title in 2020, did not face a single break point and broke De Minaur's serve three times.
Daniil Medvedev is still searching for his first ATP tournament victory this year after the world number five lost to Australia's Alexei Popyrin for the first time in his career at the Paris Masters
Both Daniil Medvedev and Stefanos Tsitsipas served sweet revenge at the Shanghai Masters on Friday, vanquishing old foes in straight sets as they progressed through to the third round.
Carlos Alcaraz and Daniil Medvedev also made winning starts to their China Open campaigns.