Third seed Stefanos Tsitsipas continued his strong start to the Australian Open with a straight-set win over Tallon Griekspoor to reach the fourth round.

The Greek, the highest seed left in the men's draw, beat the 63rd-ranked Dutchman 6-2 7-6 (7-5) 6-3.

Tsitsipas has yet to drop a set in Melbourne as he bids for his first Grand Slam title.

He will face Jannik Sinner next after the Italian fought back from two sets down to beat Marton Fucsovics.

Sinner, seeded 15th, came through 4-6 4-6 6-1 6-2 6-0 against Hungary's Fucsovics.

It is the first time in his career that he has come back from two sets down to win at a Grand Slam.

Sixth seed Felix Auger-Aliassime beat Francisco Cerundolo 6-1 3-6 6-1 6-4 to set up a meeting with rising Czech star Jiri Lehecka, who beat Britain's Cameron Norrie.

Last year's finalist Daniil Medvedev will be in action later on Friday.