The 24-year-old Sinner clinched victory on his first match point and plays unseeded Francisco Cerundolo in the third round.
“I felt like mostly the movement (was good),” said Sinner, who won an ATP 500 tournament in Vienna on Sunday despite having cramps.
Defending champion Alexander Zverev joined Sinner in round three by rallying from 3-1 down in the final set to beat Camilo Ugo Carabelli 6-7 (5), 6-1, 7-5.
The third-seeded German made a telling difference on his second serve, winning 78% of points compared to 42% for his opponent, who dropped his serve four times. Zverev next plays 15th-seeded Alejandro Davidovich Fokina.
Elsewhere, ninth-seeded Felix Auger-Aliassime of Canada rallied from a break down in the second set and 3-0 down in the third set tiebreaker in a 5-7, 7-6 (5), 7-6 (4) win over Frenchman Alexandre Muller.
Auger-Aliassime’s erratic performance combined 50 winners and 55 unforced errors as he he maintained his chances of reaching the season-ending, eight-player ATP Finals in Turin, Italy.
