Stefanos Tsitsipas advanced to the Australian Open third round without hitting a ball after benefitting from Philipp Kohlschreiber's withdrawal.

Sixth seed Tsitsipas was scheduled to face Kohlschreiber on Wednesday, however, the German veteran succumbed to a muscle strain.

Greek star Tsitsipas - last year's semi-finalist - will face either 32nd seed Milos Raonic or Cristian Garin for a spot in the fourth round at Melbourne Park.

Tsitsipas announced himself after stunning Roger Federer en route to the Australian Open semis in 2019, the 21-year-old's run ended by 19-time grand slam champion Rafael Nadal.