Fourth seed Stefanos Tsitsipas was pushed hard Thursday by Sebastian Baez, but he found the winning formula, overcoming the Argentine 7-6(1), 6-7(5), 6-3, 6-4 to reach the third round at the Australian Open for the fourth year in a row.

The Greek never found top form on Margaret Court Arena as he was tested in a physical clash against the resilient 21-year-old. However, he demonstrated an abundance of grit and character, raising his level in the third and fourth sets to advance after three hours and 22 minutes.

“It wasn’t easy. But I am glad I overcame that obstacle today,” Tsitsipas said in his-court interview. “Lots of fighting, a little bit of swearing, but I am glad to be in the third round. It was a pretty hot day today, but I tried to play with my heart and it paid off in the end.”

The Greek will next play the World No. 56 Benoit Paire.