Victory was Nadal's 379th ATP Masters 1000 win, breaking a tie with Swiss legend Roger Federer for the all-time lead.
Rafael Nadal stepped closer to a record 35th Masters 1000 title on Thursday, dispatching Argentina's Guido Pella 6-3, 6-4 Thursday to power into the ATP Montreal quarter-finals.
Nadal, who won this event for the fourth time a year ago, battled through the wind and broke Pella's service four times in the triumph.
"Let's see tomorrow. Another opportunity to be in another final".
"I asked Fabio what's going on in his foot because I saw him asking for treatment". "On the other side, I played a good match tactically".
Gael Monfils and Roberto Bautista Agut will also meet after wins over Hubert Hurkacz and Richard Gasquet respectively.
Second-seeded Dominic Thiem advanced to the quarterfinals of the Rogers Cup with a 7-6 (7), 6-4 victory over Marin Cilic on Thursday (Aug 8). "That's the difference. That's also made the transition pretty easy".
Sixth-seeded Karen Khachanov of Russian Federation beat Montreal teenager Felix Auger-Aliassime 6-7 (7), 7-5, 6-3 in the afternoon at windy and raucous IGA Stadium.
"With all the traveling and short transition, two very tough matches yesterday and two days ago, I think the battery was empty today", said Thiem who won Kitzbuhel on Sunday. "It just means that I still have things to improve to win these type of matches and to deal better with these type of moments". "But, of course, I am nearly 15 years older", said Nadal smiling.
Earlier on Friday, the eighth-seeded Medvedev needed just under 57 minutes to finish off Thiem, the No. 2 seed from Austria. But we are used to playing like this.
Zverev beat Georgia's Nikoloz Basilashvili 7-5, 5-7, 7-6, while Khachanov defeated Canadian youngster Felix Auger-Aliassime 6-7, 7-5, 6-3. He went on to defeat Karen Khachanov in the semi-finals and Stefanos Tsitsipas in the championship match. "It should be a great match".
The quarter-final comeback keeps the Spaniard's hopes of repeating his title from 2018 alive as he awaits the victor of the clash between Frenchman Gael Monfils and Spain's Roberto Bautista Agut.