Another Australian teen sensation Alexei Popyrin is into the third round of the Australian Open after Dominic Thiem retired midway through the third set of their Melbourne Park clash.

The 19-year-old was well on top before the Austrian seventh seed and 2018 French Open finalist called it quits while trailing 7-5 6-4 2-0.

Thiem, who had a five-set first round win, called for the trainer midway through the second set citing general fatigue.