Top-seeded Canadian Felix Auger-Aliassime survived a scare in the second round of the UniCredit Firenze Open to beat Germany's Oscar Otte 6-4, 6-7 (2), 6-2 on Thursday
Otte rallied from 3-1 down in the second set to take the tiebreak, which he won handily. But Auger-Aliassime, who served 13 aces,
won the last four games of the crucial third set to get ahead of the German, who had eight aces and saved five of 10 break points.
Auger-Aliassime will face American eighth seed Brandon Nakashima in the quarterfinals. Nakashima won 6-3, 6-4 over Turkish qualifier Altug Celikbilek.
Third seed Lorenzo Musetti of Italy defeated Spain's Bernabe Zapata Miralles 6-3, 6-0 in just 69 minutes, while Mackenzie McDonald of the US advanced past Italian wild card Francesco Passaro 6-4, 7-5.
American Sebastian Korda rallied to beat Spanish third seed Roberto Bautista Agut 5-7, 6-4, 6-4 in two hours and 44 minutes to reach the quarter-finals in Spain.
He also saved seven of nine break points and held a massive 52-14 lead over Bautista Agut for the winner.
Korda's quarterfinal opponent will be Andy Murray from Great Britain. In the draw as a wild card, the three-time Grand Slam champion outlasted Argentine Pedro Cachin 2-6, 7-5, 7-6 (3).