2024 National Bank Open – Men's singles

Alexei Popyrin defeated Andrey Rublev in the final, 6–2, 6–4 to win the men's singles tennis title at the 2024 Canadian Open. It was his first Masters 1000 title and third career ATP Tour title. Popyrin saved three match points en route to the title, in the third round against Grigor Dimitrov. He was the first Australian to win a Masters title since Lleyton Hewitt at the 2003 Indian Wells Masters. Ranked No. 62, Popyrin was the second lowest-ranked men's singles champion at the Canadian Open, after Mikael Pernfors (ranked No. 95) in 1993.

Jannik Sinner was the defending champion, but lost to Rublev in the quarterfinals. Rublev was just the third player born in 1990 or later to reach the quarterfinals or better at all nine Masters events and all four majors, after Daniil Medvedev and Dimitrov.