Learner Tien, the 19-year-old American who knocked out Daniil Medvedev at the Australian Open

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At 19 years and one month, Learner Tien is the second youngest American to qualify for the third round of the Australian Open, since the start of the Open era, beaten only by Pete Sampras, who had reached it before even turning 18 and a half, in 1990. He is also the youngest representative of US tennis in the 3rd round of a Grand Slam since Donald Young, at the US Open… 2007!