Learner Tien is set for a massive rankings rise after stunning world No 5 Daniil Medvedev at the Australian Open.
Tien, 19, become youngest American man to reach the Australian Open's third round since Pete Sampras did so aged 18 in 1990.
The 19-year-old from Irvine, California nearly lost a two-set lead from match point up but held off a late surge from a former world No. 1 to win the biggest match of his career.
Iga Swiatek tends not to waste time in the first week of Grand Slams. When the five-time Grand Slam champion ...