The final match of the day saw American Learner Tien, playing in his first major outside of the U.S. Open, upset No. 5 seed ...
The 19-year-old who was a late qualifier to the Grand Slam secured the biggest win of his young career on Thursday ...
Learner Tien beats Daniil Medvedev, is youngest American man in Australian Open's 3rd round since Pete Sampras in 1990.
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