Tennys Sandgren of the US plays a forehand return to Switzerland's Stanislas Wawrinka during their men's singles second round match on day four of the Australian Open tennis tournament in Melbourne. Pic/AFP

The United States' Tennys Sandgren on Thursday defeated ninth seed Stan Wawrinka 6-2, 6-1, 6-4 to qualify for the third round of the Australian Open tennis tournament. Sandgren needed an hour and 28 minutes to eliminate eighth-ranked Wawrinka from his first tournament in 2018, reports Efe.