The rise of learnertien has been UNREAL 😳 The 20-year-old star will play in the Australian Open quarterfinal today at 6:30 PM against world No. 3 Alexander Zverev. He knocked off No. 11 Daniel Medvedev in the Round of 16. (🎥: tennischannel) . . . . #tennis #australianopen #learnertien #asian #asianamerican