# 2021 National Bank Open – Men's singles

Daniil Medvedev defeated Reilly Opelka in the final, 6–4, 6–3 to win the men's singles tennis title at the 2021 Canadian Open. It was his fourth ATP Masters 1000 title and 12th career title. Opelka was contesting his maiden Masters 1000 final.
Rafael Nadal was the two-time reigning champion from when the event was last held in 2019 and was vying to tie Ivan Lendl's record of six Canadian Open titles, but did not participate due to a foot injury.

## Seeds

All seeds received a bye into the second round.
    01. Daniil Medvedev (champion)
    02. Rafael Nadal (withdrew due to left foot injury)
    03. Stefanos Tsitsipas (semifinals)
    04. Andrey Rublev (third round)
    05. Denis Shapovalov (second round)
    06. Casper Ruud (quarterfinals)
    07. Hubert Hurkacz (quarterfinals)
    08. Diego Schwartzman (third round)
    09. Félix Auger-Aliassime (second round)
    10. Roberto Bautista Agut (quarterfinals)
    11. Gaël Monfils (quarterfinals)
    12. Alex de Minaur (second round)
    13. Cristian Garín (second round)
    14. Grigor Dimitrov (second round)
    15. Aslan Karatsev (second round)
    16. Jannik Sinner (second round)
Click on the seed number of a player to go to their draw section.

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Daniil Medvedev | 2 | 7$^8$ | 7$^7$ | | | | | | | | | |
| 7 | Hubert Hurkacz | 6 | 6$^6$ | 6$^5$ | | | | | | | | | |
| 7 | Hubert Hurkacz | 6 | 6$^6$ | 6$^5$ | 1 | Daniil Medvedev | 6 | 6 | | | | | |
| | | | | | | John Isner | 2 | 2 | | | | | |
| | John Isner | 7$^7$ | 6 | | | John Isner | 2 | 2 | | | | | |
| 11 | Gaël Monfils | 6$^5$ | 4 | | | | | | | | | | |
| 11 | Gaël Monfils | 6$^5$ | 4 | | | | | | | 1 | Daniil Medvedev | 6 | 6 |
| | | | | | | | | | | | Reilly Opelka | 4 | 3 |
| 6 | Casper Ruud | 1 | 4 | | | | | | | | | | | Reilly Opelka | 4 | 3 |
| 3 | Stefanos Tsitsipas | 6 | 6 | | | | | | | | | | |
| 3 | Stefanos Tsitsipas | 6 | 6 | | 3 | Stefanos Tsitsipas | 7$^7$ | 6$^4$ | 4 | | | | |
| | | | | | | Reilly Opelka | 6$^2$ | 7$^7$ | 6 | | | | |
| 10 | Roberto Bautista Agut | 3 | 6$^1$ | | | Reilly Opelka | 6$^2$ | 7$^7$ | 6 | | | | |
| | Reilly Opelka | 6 | 7$^7$ | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | D Medvedev | 4 | 6 | 6 | | | | | | | | | | |
| | D Evans | 4 | 4 | | | A Bublik | 6 | 3 | 4 | | | | | | | | | | |
| | A Bublik | 6 | 6 | | | | | | | 1 | D Medvedev | 6 | 6 | | | | | | |
| Q | J Duckworth | 7$^7$ | 6 | | | | | | | Q | J Duckworth | 2 | 4 | | | | | | |
| | T Fritz | 6$^2$ | 3 | | Q | J Duckworth | 6 | 6 | | | | | | | | | | | |
| | | | | | 16 | J Sinner | 3 | 4 | | | | | | | | | | | |
| | | | | | | | | | | | | | | | 1 | D Medvedev | 2 | 7$^8$ | 7$^7$ |
| | | | | | | | | | | | | | | | 7 | H Hurkacz | 6 | 6$^6$ | 6$^5$ |
| | | | | | 12 | A de Minaur | 1 | 1 | | | | | | | | | | | |
| WC | J Brooksby | 6 | 0 | 4 | | N Basilashvili | 6 | 6 | | | | | | | | | | | |
| | N Basilashvili | 2 | 6 | 6 | | | | | | | N Basilashvili | 7$^9$ | 4 | 4 | | | | | |
| | M Kecmanović | 4 | 7$^7$ | 2 | | | | | | 7 | H Hurkacz | 6$^7$ | 6 | 6 | | | | | |
| PR | K Nishikori | 6 | 6$^5$ | 6 | PR | K Nishikori | | | | | | | | | | | | | |
| | | | | | 7 | H Hurkacz | w/o | | | | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | A Rublev | 7$^7$ | 6 | | | | | | | | | |
| | J-L Struff | 7$^7$ | 2 | 4 | | F Fognini | 6$^4$ | 3 | | | | | | | | | |
| | F Fognini | 6$^2$ | 6 | 6 | | | | | | 4 | A Rublev | 5 | 6$^5$ | | | | |
| | J Isner | 6 | 6 | | | | | | | | J Isner | 7 | 7$^7$ | | | | |
| | A Davidovich Fokina | 4 | 1 | | | J Isner | 4 | 6 | 6 | | | | | | | | |
| | | | | | 13 | C Garín | 6 | 3 | 4 | | | | | | | | |
| | | | | | | | | | | | | | | | J Isner | 7$^7$ | 6 |
| | | | | | | | | | | | | | | 11 | G Monfils | 6$^5$ | 4 |
| | | | | | 11 | G Monfils | 3 | 6 | 6 | | | | | | | | |
| | J Millman | 6 | 7$^7$ | | | J Millman | 6 | 3 | 4 | | | | | | | | |
| Q | R Berankis | 3 | 6$^4$ | | | | | | | 11 | G Monfils | 6 | 7$^7$ | | | | |
| Q | Y Nishioka | 4 | 3 | | | | | | | LL | F Tiafoe | 1 | 6$^2$ | | | | |
| LL | F Tiafoe | 6 | 6 | | LL | F Tiafoe | 6 | 6 | | | | | | | | | |
| | | | | | 5 | D Shapovalov | 1 | 4 | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 6 | C Ruud | 6 | 3 | 6 | | | | | | | | |
| | A Ramos Viñolas | 2 | 6 | 3 | | M Čilić | 3 | 6 | 3 | | | | | | | | |
| | M Čilić | 6 | 4 | 6 | | | | | | 6 | C Ruud | 6 | 6 | | | | |
| | D Lajović | 3 | 6 | 6 | | | | | | | D Lajović | 4 | 3 | | | | |
| Q | E Ruusuvuori | 6 | 3 | 3 | | D Lajović | 7 | 6 | | | | | | | | | |
| | | | | | 9 | F Auger-Aliassime | 5 | 4 | | | | | | | | | |
| | | | | | | | | | | | | | | 6 | C Ruud | 1 | 4 |
| | | | | | | | | | | | | | | 3 | S Tsitsipas | 6 | 6 |
| | | | | | 15 | A Karatsev | 6$^7$ | 4 | | | | | | | | | |
| | C Norrie | 4 | 7 | 4 | | K Khachanov | 7$^9$ | 6 | | | | | | | | | |
| | K Khachanov | 6 | 5 | 6 | | | | | | | K Khachanov | 3 | 2 | | | | |
| | L Sonego | 3 | 4 | | | | | | | 3 | S Tsitsipas | 6 | 6 | | | | |
| | U Humbert | 6 | 6 | | | U Humbert | 3 | 7$^{15}$ | 1 | | | | | | | | |
| | | | | | 3 | S Tsitsipas | 6 | 6$^{13}$ | 6 | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | D Schwartzman | 7 | 6 | | | | | | | | | |
| | B Paire | 6 | 6 | | | B Paire | 5 | 1 | | | | | | | | | |
| SE | M McDonald | 3 | 4 | | | | | | 8 | D Schwartzman | 3 | 6 | 5 | | | | |
| WC | V Pospisil | 7$^7$ | 2 | 3 | | | | | 10 | R Bautista Agut | 6 | 3 | 7 | | | | |
| Q | T Paul | 6$^5$ | 6 | 6 | Q | T Paul | 3 | 4 | | | | | | | | | |
| | | | | | 10 | R Bautista Agut | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 10 | R Bautista Agut | 3 | 6$^1$ |
| | | | | | | | | | | | | | | | R Opelka | 6 | 7$^7$ |
| | | | | | 14 | G Dimitrov | 3 | 4 | | | | | | | | | |
| WC | N Kyrgios | 6 | 6$^4$ | 4 | | R Opelka | 6 | 6 | | | | | | | | | |
| | R Opelka | 4 | 7$^7$ | 6 | | | | | | R Opelka | 4 | 7$^8$ | 7$^7$ | | | | |
| | L Harris | 6 | 6 | | | | | | | L Harris | 6 | 6$^6$ | 6$^4$ | | | | |
| Q | B Schnur | 3 | 2 | | | L Harris | 6 | 6 | | | | | | | | | |
| | | | | | LL | F López | 2 | 3 | | | | | | | | | |

## Qualifying
### Seeds

* Frances Tiafoe (qualifying competition, lucky loser)
* Tommy Paul (qualified)
* Yoshihito Nishioka (qualified)
* Dominik Koepfer (first round)
* Lorenzo Musetti (removed for exiting Covid-19 bubble)
* Marcos Giron (first round)
* Emil Ruusuvuori (qualified)
* Alexei Popyrin (first round)
* James Duckworth (qualified)
* Ričardas Berankis (qualified)
* Feliciano López (qualifying competition, lucky loser)
* Benjamin Bonzi (first round)

### Qualifiers

* Emil Ruusuvuori
* Tommy Paul
* Yoshihito Nishioka
* James Duckworth
* Ričardas Berankis
* Brayden Schnur

### Lucky losers

* Frances Tiafoe
* Feliciano López

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Frances Tiafoe | 6 | 0 | 6 | | | | |
| | J. J. Wolf | 2 | 6 | 4 | | | | |
| | J. J. Wolf | 2 | 6 | 4 | 1 | Frances Tiafoe | 1 | 4 |
| | | | | | 7 | Emil Ruusuvuori | 6 | 6 |
| WC | Steven Diez | 3 | 2 | | 7 | Emil Ruusuvuori | 6 | 6 |
| 7 | Emil Ruusuvuori | 6 | 6 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Tommy Paul | 7$^7$ | 6 | | | | | |
| WC | Liam Draxl | 6$^0$ | 4 | | | | | |
| WC | Liam Draxl | 6$^0$ | 4 | | 2 | Tommy Paul | 7$^7$ | 6 |
| | | | | | | Liam Broady | 6$^3$ | 3 |
| | Liam Broady | 5 | 7$^9$ | 7$^7$ | | Liam Broady | 6$^3$ | 3 |
| 8 | Alexei Popyrin | 7 | 6$^7$ | 6$^2$ | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Yoshihito Nishioka | 7$^7$ | 6 | | | | |
| | Michael Mmoh | 6$^5$ | 2 | | | | |
| | Michael Mmoh | 6$^5$ | 2 | 3 | Yoshihito Nishioka | 7 | 7$^8$ |
| | | | | 11 | Feliciano López | 5 | 6$^6$ |
| | Maxime Cressy | 6$^4$ | 4 | 11 | Feliciano López | 5 | 6$^6$ |
| 11 | Feliciano López | 7$^7$ | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Dominik Koepfer | 3 | 4 | | | | | |
| WC | Peter Polansky | 6 | 6 | | | | | |
| WC | Peter Polansky | 6 | 6 | WC | Peter Polansky | 6 | 1 | 2 |
| | | | | 9 | James Duckworth | 4 | 6 | 6 |
| | Illya Marchenko | 1 | 3 | 9 | James Duckworth | 4 | 6 | 6 |
| 9 | James Duckworth | 6 | 6 | | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| Alt | Max Purcell | 6$^2$ | 7$^7$ | 6$^4$ | | | | |
| | Emilio Gómez | 7$^7$ | 6$^2$ | 7$^7$ | | | | |
| | Emilio Gómez | 7$^7$ | 6$^2$ | 7$^7$ | | Emilio Gómez | 4 | 5 |
| | | | | | 10 | Ričardas Berankis | 6 | 7 |
| | Norbert Gombos | 6$^5$ | 4 | | 10 | Ričardas Berankis | 6 | 7 |
| 10 | Ričardas Berankis | 7$^7$ | 6 | | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Marcos Giron | 2 | 3 | | | | | |
| WC | Brayden Schnur | 6 | 6 | | | | | |
| WC | Brayden Schnur | 6 | 6 | | WC | Brayden Schnur | 7$^9$ | 6 |
| | | | | | | Daniel Elahi Galán | 6$^7$ | 3 |
| | Daniel Elahi Galán | 6 | 2 | 6 | | Daniel Elahi Galán | 6$^7$ | 3 |
| 12 | Benjamin Bonzi | 3 | 6 | 2 | | | | |