One of the players who has impressed Roddick is 19-year-old American Learner Tien, who started making noise early in the tournament by upsetting No. 5 Daniil Medvedev in the second round.

Nineteen year old Learner Tien from Vietnam, now USA, has taken the tennis world and not only the current Australian Tennis Open by storm.

Premier defenses led by the stingiest secondaries in the country most likely will determine the outcome of the College ...

American Learner Tien described his "surreal" experience at the Australian Open, where he reached the fourth round after coming through the qualifying rounds—a total of six consecutive ...