Tsitsipas, Rublev into Open third round

Stefanos Tsitsipas took four sets to get past Sebastian Baez in the Australian Open second round. (AAP)

Stefanos Tsitsipas has overcome a second-set blip to beat Sebastian Baez in four sets and seal his ticket to the Australian Open third round.

Greek sensation Tsitsipas had plenty of support on hand at Margaret Court Arena and traded tiebreaks against the young Argentinian before pulling away to prevail 7-6 (7-1) 6-7 (5-7) 6-3 6-4 on Thursday