Finland's Emil Ruusuvuori collected a big-name scalp on the opening day of the Canadian Open, defeating three-time grand slam winner Stan Wawrinka 6-3 3-6 6-3 on Monday.

Although the 37-year-old Wawrinka is no longer at his best – ranked 322nd in the world – he still put up a strong fight against his 23-year-old opponent, creating eight break point opportunities in the match while facing nine.

Ruusuvuori will play eighth seed Hubert Hurkacz in the second round in a tough matchup, while Slovakia's Alex Molcan will play fourth seed Casper Ruud after defeating American Mackenzie McDonald 7-6 (7-1) 6-4.

Molcan's advantage was in his serve, winning 74 per cent (49-of-66) of his service points compared to 59 per cent (49-of-83) for McDonald.

In a clash between a pair of top-30 talents, Russia's Karen Khachanov got the better of Argentina's Francisco Cerundolo 7-6 (7-4) 5-7 6-3. He will play the winner between 13th seed Marin Cilic and Croatia's Borna Coric next.

Recent runner-up of the Atlanta Open Jenson Brooskby had no issues with Kazakhstan's Alexander Bublik, winning 6-2 6-3, and he will likely play Roberto Bautista-Agut in the second round as the Spaniard leads 7-6 (7-5) 2-1 with a break in the second set when a rain delay ended the day's play.

This match is the perfect description of: 'the crowd goes wild' @denis_shapo | @OBNmontreal | #OBN22 pic.twitter.com/4hAB3OWUFC
— ATP Tour (@atptour) August 9, 2022

One of Canada's top hopes, Denis Shapovalov, will have his back up against the wall when his match resumes against Alex de Minaur, losing the first set 7-5, with the rain arriving in the middle of the second-set tiebreaker.

Jack Draper will head back onto the court with a set advantage against Hugo Gaston after winning the opener 6-2, although he will have to save a break point first up.