The Argentine won the game against his Serbian counterpart in two hours and 21 minutes.
Elsewhere, Italian Gianluca Mager continued his good run of form by beating another Aussie, Alexei Popyrin, 7-5, 6-2. Mager converted four of his 11 break-point opportunities to advance in just under an hour and a half.
The Italian will next take on Aslan Karatsev. The No. 3 seed from Russia took on Aljaz Bedene of Slovenia in a real battle but came out on top 6-3, 4-6, 7-6(5) in the final match of the day. Karatsev sent down nine aces and had to save one match point to claim the victory.