American teenager makes incredible history at Australian Open

American teenager Learner Tien on Saturday became the youngest male player to reach the fourth round of the Australian Open since Rafael Nadal in 2005. 

The 19-year-old southpaw beat unseeded Frenchman Corentin Moutet in straight sets, 7-6, 6-3, 6-3, in the third round to set up a fourth-round clash with Italian veteran Lorenzo Sonego.