| Champ: |  Alexei Popyrin |
| Runner: | Andrey Rublev |
| Score: | 6–2, 6–4 |
| Draw: | 56 |
| Seeds: | 16 |
| Main Name: | Canadian Open (tennis) Canadian Open |
See main article: 2024 National Bank Open.
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 his third-round match against Grigor Dimitrov.[1] He became the first Australian player to win a Masters title since Lleyton Hewitt in 2003 at Indian Wells,[2] and fourth to do so overall since the category's establishment in 1990. 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, and the lowest-ranked finalist since Harel Levy in 2000.[3]
Jannik Sinner was the defending champion,[4] but lost to Rublev in the quarterfinals.[5] By reaching the quarterfinals, Rublev became 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 Grigor Dimitrov.[6]
For the first time since the 2012 Paris Masters, three unseeded players reached the semifinals of the same Masters 1000 tournament.
The top eight seeds received a bye into the second round.
The following are the seeded players. Seedings are based on ATP rankings as of 29 July 2024. Rankings and points before are as of 5 August 2024.
| Seed | Rank | Player | Points before | Points defending | Points earned | Points after | Status | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 |  Jannik Sinner | 9,570 | 1,000 | 200 | 8,770 | Quarterfinals lost to Andrey Rublev [5] | |
| 2 | 4 | Alexander Zverev | 6,845 | (50)† | 200 | 6,995 | Quarterfinals lost to  Sebastian Korda | |
| 3 | 5 | Daniil Medvedev | 6,525 | 180 | 10 | 6,355 | ||
| 4 | 6 |  Hubert Hurkacz | 4,105 | 90 | 200 | 4,215 | Quarterfinals lost to Alexei Popyrin | |
| 5 | 8 | Andrey Rublev | 3,975 | 10 | 650 | 4,615 | Runner-up, lost to Alexei Popyrin | |
| 6 | 9 |  Casper Ruud | 3,880 | 90 | 100 | 3,890 | Third round withdrew due to illness | |
| 7 | 10 | Grigor Dimitrov | 3,600 | 0 | 100 | 3,700 | ||
| 8 | 11 | Stefanos Tsitsipas | 3,465 | 10 | 10 | 3,465 | Second round lost to  Kei Nishikori [PR] | |
| 9 | 13 | Taylor Fritz | 3,330 | 90 | 50 | 3,290 | ||
| 10 | 12 | Tommy Paul | 3,375 | 360 | 50 | 3,065 | Second round lost to Brandon Nakashima [Q] | |
| 11 | 14 | Ben Shelton | 2,950 | 45 | 50 | 2,955 | Second round lost to Alexei Popyrin | |
| 12 | 15 |  Ugo Humbert | 2,360 | 45 | 50 | 2,365 | ||
| 13 | 17 | Holger Rune | 2,300 | 10 | 100 | 2,390 | Third round lost to Alexander Zverev [2] | |
| 14 | 19 | 2,115 | 10 | 10 | 2,115 | |||
| 15 | 21 | Alejandro Tabilo | 1,918 | (25)‡ | 100 | 1,993 | Third round lost to Jannik Sinner [1] | |
| 16 | 22 | Karen Khachanov | 1,830 | 0 | 50 | 1,880 | Second round lost to Matteo Arnaldi |
The following players would have been seeded, but withdrew before the tournament began.
| Rank | Player | Points before | Points defending | Points after | Withdrawal reason | |
|---|---|---|---|---|---|---|
| 2 |  Novak Djokovic | 8,460 | 0 | 8,460 | Schedule change | |
| 3 |  Carlos Alcaraz | 8,130 | 180 | 7,950 | Fatigue | |
| 7 | Alex de Minaur | 4,080 | 600 | 3,480 | Hip injury | |
| 16 | Lorenzo Musetti | 2,340 | 90 | 2,250 | Fatigue |