MELBOURNE, Jan 22 ― Sixth seed Stefanos Tsitsipas has advanced to the third round of the Australian Open after his German opponent Philipp Kohlschreiber withdrew due to injury, organisers said today.

ATP Finals champion Tsitsipas, 21, will meet either Canadian 32nd seed Milos Raonic or Cristian Garin of Chile in the third round, having never faced either opponent before.

"Unfortunately Philipp Kohlschreiber has withdrawn from his #AusOpen match vs Stefanos Tsitsipas due to a muscle strain,” the Australian Open said on Twitter.

Tsitsipas, who last year defeated Roger Federer on his way to the Melbourne Park semi-finals, had won both his previous meetings against world No. 79 Kohlschreiber.

The Greek is rated by many as the most likely to break the three-year grip Rafa Nadal, Novak Djokovic and Federer have held on the Grand Slam titles. ― Reuters