Learner Tien arrived in Melbourne as the #16 seed in the Australian Open….Qualifying Tournament. Thursday, he continued high-wire act run into the Round of 32 by defeating Daniil Medvedev, the #5 seed in the Australian Open main draw.

Learner Tien pulled off a massive upset against Daniil Medvedev at the Australian Open. So, who is Tien, the 19-year-old out of California?

Learner Tien, a 19-year-old qualifier from California, became the youngest American man to reach the Australian Open's third round since Pete Sampras in 1990, upsetting a racket-tossing Daniil Medvedev 6-3,