MONTREAL — Two years after his remarkable victory over Rafael Nadal at the Rogers Cup in Montreal, Denis Shapovalov still watches video of the match, one of the most significant in Canadian tennis history.

He does so when he needs to regain the focus and energy required to compete on the ATP Tour.

“I always kind of try to go back to when I’m a little bit down or confident,” Shapovalov said after his first-round win over the Frenchman Pierre-Hugues Herbert at the Rogers Cup on Monday. “I try to go back into the best moments of my life.”

Then 18 and in his first professional season, Shapovalov, a Toronto resident, stunned Nadal, 3-6, 6-4, 7-6 (4), in the round of 16 before a boisterous crowd . Shapovalov then defeated the Frenchman Adrian Mannarino before being ousted by the eventual champion, Alexander Zverev, in the semifinals.