Top-seeded defending champion Rafael Nadal has advanced to the final of the Canadian Open after Frenchman Gael Monfils withdrew before their semi-final.

Nadal will face eighth-seeded Daniil Medvedev, a 6-1 7-6 (7-6) winner over sixth-seeded Karen Khachanov in the all-Russian first semi-final.

Monfils, seeded 16th, outlasted 10th-seeded Roberto Bautista Agut of Spain 6-4 3-6 7-6 (7-2) in a match suspended on Friday night because of lightning.

Monfils finally finished off Agut after a rain delay on Saturday but battled a sore left ankle that forced him to pull out of the semi-final.

Nadal won last year in Toronto for his fourth title in the event.

He has 82 singles victories, winning the French Open in June for his second title of the year.