# 2021 Western & Southern Open – Men's singles

Alexander Zverev defeated Andrey Rublev in the final, 6–2, 6–3 to win the men's singles tennis title at the 2021 Cincinnati Masters. It was his fifth Masters 1000 title and 17th career singles title on the ATP Tour.
Novak Djokovic was the reigning champion, but did not participate.

## Seeds

The top eight seeds receive a bye into the second round.
    01. Daniil Medvedev (semifinals)
    02. Stefanos Tsitsipas (semifinals)
    03. Alexander Zverev (champion)
    04. Andrey Rublev (final)
    05. Matteo Berrettini (third round)
    06. Denis Shapovalov (second round)
    07. Pablo Carreño Busta (quarterfinals)
    08. Casper Ruud (quarterfinals)
    09. Hubert Hurkacz (third round)
    10. Diego Schwartzman (third round)
    11. Jannik Sinner (second round)
    12. Félix Auger-Aliassime (quarterfinals)
    13. Roberto Bautista Agut (first round)
    14. Alex de Minaur (second round)
    15. David Goffin (first round)
    16. Cristian Garín (first 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 | 6 | 6 | | | | | | | | | | |
| 7 | Pablo Carreño Busta | 1 | 1 | | | | | | | | | | |
| 7 | Pablo Carreño Busta | 1 | 1 | | 1 | Daniil Medvedev | 6 | 3 | 3 | | | | |
| | | | | | 4 | Andrey Rublev | 2 | 6 | 6 | | | | |
| 4 | Andrey Rublev | 6 | 3 | 6 | 4 | Andrey Rublev | 2 | 6 | 6 | | | | |
| | Benoît Paire | 2 | 6 | 3 | | | | | | | | | |
| | Benoît Paire | 2 | 6 | 3 | | | | | | 4 | Andrey Rublev | 2 | 3 |
| | | | | | | | | | | 3 | Alexander Zverev | 6 | 6 |
| 8 | Casper Ruud | 1 | 3 | | | | | | | | | | | 3 | Alexander Zverev | 6 | 6 |
| 3 | Alexander Zverev | 6 | 6 | | | | | | | | | | |
| 3 | Alexander Zverev | 6 | 6 | | 3 | Alexander Zverev | 6 | 3 | 7$^7$ | | | | |
| | | | | | 2 | Stefanos Tsitsipas | 4 | 6 | 6$^4$ | | | | |
| 12 | Félix Auger-Aliassime | 2 | 7 | 1 | 2 | Stefanos Tsitsipas | 4 | 6 | 6$^4$ | | | | |
| 2 | Stefanos Tsitsipas | 6 | 5 | 6 | | | | | | | | | |

### Top half
#### Section 1

| 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | D Medvedev | 6 | 6 | | | | | | | | |
| WC | B Nakashima | 5 | 2 | | WC | M McDonald | 2 | 2 | | | | | | | | |
| WC | M McDonald | 7 | 6 | | | | | | 1 | D Medvedev | 6 | 6 | | | | |
| | A Bublik | 3 | 6 | 7$^7$ | | | | | | G Dimitrov | 3 | 3 | | | | |
| Q | M Giron | 6 | 3 | 6$^5$ | | A Bublik | 3 | 5 | | | | | | | | |
| | G Dimitrov | 6 | 6 | | | G Dimitrov | 6 | 7 | | | | | | | | |
| 13 | R Bautista Agut | 3 | 4 | | | | | | | | | | 1 | D Medvedev | 6 | 6 |
| 9 | H Hurkacz | 6 | 6$^3$ | 6 | | | | | | | | | 7 | P Carreño Busta | 1 | 1 |
| | A Davidovich Fokina | 1 | 7$^7$ | 1 | 9 | H Hurkacz | 7$^7$ | 6 | | | | | | | | |
| Q | R Gasquet | 4 | 4 | | WC | A Murray | 6$^4$ | 3 | | | | | | | | |
| WC | A Murray | 6 | 6 | | | | | | 9 | H Hurkacz | 6$^6$ | 6$^3$ | | | | |
| LL | D Koepfer | 7$^7$ | 5 | 6 | | | | | 7 | P Carreño Busta | 7$^8$ | 7$^7$ | | | | |
| | J-L Struff | 6$^2$ | 7 | 3 | LL | D Koepfer | 4 | 2 | | | | | | | | |
| | | | | | 7 | P Carreño Busta | 6 | 6 | | | | | | | | |

#### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | A Rublev | 5 | 6 | 6 | | | | | | | | | | |
| | A Karatsev | 5 | 3 | | | M Čilić | 7 | 3 | 1 | | | | | | | | | | |
| | M Čilić | 7 | 6 | | | | | | | 4 | A Rublev | 7$^7$ | 7$^7$ | | | | | | |
| | D Lajović | 6$^0$ | 2 | | | | | | | | G Monfils | 6$^2$ | 6$^5$ | | | | | | |
| | G Monfils | 7$^7$ | 6 | | | G Monfils | 6 | 7 | | | | | | | | | | | |
| | F Krajinović | 6 | 4 | 4 | 14 | A de Minaur | 3 | 5 | | | | | | | | | | | |
| 14 | A de Minaur | 0 | 6 | 6 | | | | | | | | | | | 4 | A Rublev | 6 | 3 | 6 |
| 11 | J Sinner | 6 | 7 | | | | | | | | | | | | | B Paire | 2 | 6 | 3 |
| | F Delbonis | 2 | 5 | | 11 | J Sinner | 7 | 6$^4$ | 4 | | | | | | | | | | |
| | J Isner | 4 | 7$^7$ | 6 | | J Isner | 5 | 7$^7$ | 6 | | | | | | | | | | |
| | C Norrie | 6 | 6$^5$ | 4 | | | | | | | J Isner | 6$^1$ | 7$^7$ | 1 | | | | | |
| | M Kecmanović | 7 | 3 | 2 | | | | | | | B Paire | 7$^7$ | 6$^2$ | 6 | | | | | |
| | B Paire | 5 | 6 | 6 | | B Paire | 6 | 4 | 7 | | | | | | | | | | |
| | | | | | 6 | D Shapovalov | 3 | 6 | 5 | | | | | | | | | | |

### 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 |
| | | | | | 8 | C Ruud | 6$^5$ | 6 | 7$^7$ | | | | | | | | |
| | R Opelka | 7$^7$ | 4 | 6 | | R Opelka | 7$^7$ | 0 | 6$^4$ | | | | | | | | |
| Q | C Moutet | 6$^3$ | 6 | 4 | | | | | | 8 | C Ruud | 6 | 6 | | | | |
| WC | F Tiafoe | 7 | 7$^{11}$ | | | | | | | 10 | D Schwartzman | 4 | 3 | | | | |
| | U Humbert | 5 | 6$^9$ | | WC | F Tiafoe | 1 | 6 | 4 | | | | | | | | |
| | D Evans | 2 | 6 | 3 | 10 | D Schwartzman | 6 | 4 | 6 | | | | | | | | |
| 10 | D Schwartzman | 6 | 4 | 6 | | | | | | | | | | 8 | C Ruud | 1 | 3 |
| 15 | D Goffin | 3 | 3 | | | | | | | | | | | 3 | A Zverev | 6 | 6 |
| PR | G Pella | 6 | 6 | | PR | G Pella | 6 | 7 | | | | | | | | | |
| | F Fognini | 7$^7$ | 6 | | | F Fognini | 1 | 5 | | | | | | | | | |
| | N Basilashvili | 6$^3$ | 3 | | | | | | | PR | G Pella | 2 | 3 | | | | |
| Q | Y Nishioka | 3 | 4 | | | | | | | 3 | A Zverev | 6 | 6 | | | | |
| | L Harris | 6 | 6 | | | L Harris | 6$^3$ | 2 | | | | | | | | | |
| | | | | | 3 | A Zverev | 7$^7$ | 6 | | | | | | | | | |

#### Section 4

| 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 |
| | | | | | 5 | M Berrettini | 6$^5$ | 6 | 7 | | | | | | | | | | |
| | T Fritz | 6 | 4 | 4 | | A Ramos Viñolas | 7$^7$ | 3 | 5 | | | | | | | | | | |
| | A Ramos Viñolas | 4 | 6 | 6 | | | | | | 5 | M Berrettini | 4 | 3 | | | | | | |
| Q | K Anderson | 2 | 4 | | | | | | | 12 | F Auger-Aliassime | 6 | 6 | | | | | | |
| | K Khachanov | 6 | 6 | | | K Khachanov | 7$^7$ | 3 | 4 | | | | | | | | | | |
| | M Fucsovics | 6$^0$ | 3 | | 12 | F Auger-Aliassime | 6$^5$ | 6 | 6 | | | | | | | | | | |
| 12 | F Auger-Aliassime | 7$^7$ | 6 | | | | | | | | | | | | 12 | F Auger-Aliassime | 2 | 7 | 1 |
| 16 | C Garín | 6 | 3 | 4 | | | | | | | | | | | 2 | S Tsitsipas | 6 | 5 | 6 |
| Q | T Paul | 4 | 6 | 6 | Q | T Paul | 6$^9$ | 2 | | | | | | | | | | | |
| | L Sonego | 6 | 7$^8$ | | | L Sonego | 7$^{11}$ | 6 | | | | | | | | | | | |
| Q | C Alcaraz | 3 | 6$^6$ | | | | | | | | L Sonego | 7 | 3 | 4 | | | | | |
| | S Korda | 6 | 6 | | | | | | | 2 | S Tsitsipas | 5 | 6 | 6 | | | | | |
| | L Đere | 4 | 4 | | | S Korda | 6$^5$ | 3 | | | | | | | | | | | |
| | | | | | 2 | S Tsitsipas | 7$^7$ | 6 | | | | | | | | | | | |

## Qualifying
### Seeds

* Richard Gasquet (qualified)
* Carlos Alcaraz (qualified)
* Tommy Paul (qualified)
* Yoshihito Nishioka (qualified)
* Dominik Koepfer (qualifying competition, lucky loser)
* Vasek Pospisil (first round)
* Lorenzo Musetti (first round)
* Marcos Giron (qualified)
* Ilya Ivashka (qualifying competition)
* Jaume Munar (qualifying competition)
* Jérémy Chardy (first round)
* Gianluca Mager (first round)
* Emil Ruusuvuori (first round)
* Alexei Popyrin (qualifying competition)

### Qualifiers

* Richard Gasquet
* Carlos Alcaraz
* Tommy Paul
* Yoshihito Nishioka
* Marcos Giron
* Corentin Moutet
* Kevin Anderson

### Lucky loser

* Dominik Koepfer

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Richard Gasquet | 6 | 6 | | | | | |
| WC | Fernando Verdasco | 4 | 0 | | | | | |
| WC | Fernando Verdasco | 4 | 0 | 1 | Richard Gasquet | 5 | 6 | 6 |
| | | | | 10 | Jaume Munar | 7 | 4 | 4 |
| | Norbert Gombos | 2 | 2 | 10 | Jaume Munar | 7 | 4 | 4 |
| 10 | Jaume Munar | 6 | 6 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Carlos Alcaraz | 6 | 6 | | | | | |
| | Thiago Monteiro | 2 | 3 | | | | | |
| | Thiago Monteiro | 2 | 3 | | 2 | Carlos Alcaraz | 6 | 6 |
| | | | | | 9 | Ilya Ivashka | 3 | 4 |
| WC | Mitchell Krueger | 3 | 6 | 3 | 9 | Ilya Ivashka | 3 | 4 |
| 9 | Ilya Ivashka | 6 | 3 | 6 | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Tommy Paul | 6 | 6 | | | | | |
| | Kwon Soon-woo | 3 | 2 | | | | | |
| | Kwon Soon-woo | 3 | 2 | 3 | Tommy Paul | 6$^5$ | 7$^7$ | 6 |
| | | | | | Tennys Sandgren | 7$^7$ | 6$^4$ | 3 |
| | Tennys Sandgren | 7$^8$ | 6 | | Tennys Sandgren | 7$^7$ | 6$^4$ | 3 |
| 11 | Jérémy Chardy | 6$^6$ | 1 | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Yoshihito Nishioka | 6 | 6 | | | | | |
| | Egor Gerasimov | 2 | 3 | | | | | |
| | Egor Gerasimov | 2 | 3 | 4 | Yoshihito Nishioka | 6$^6$ | 7 | 6 |
| | | | | | Ričardas Berankis | 7$^8$ | 5 | 2 |
| | Ričardas Berankis | 6 | 7 | | Ričardas Berankis | 7$^8$ | 5 | 2 |
| 12 | Gianluca Mager | 4 | 5 | | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Dominik Koepfer | 2 | 6 | 6 | | | | |
| | Andreas Seppi | 6 | 4 | 4 | | | | |
| | Andreas Seppi | 6 | 4 | 4 | 5 | Dominik Koepfer | 6$^6$ | 4 |
| | | | | | 8 | Marcos Giron | 7$^8$ | 6 |
| WC | J. J. Wolf | 3 | 3 | | 8 | Marcos Giron | 7$^8$ | 6 |
| 8 | Marcos Giron | 6 | 6 | | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Vasek Pospisil | 2 | 2 | | | | | |
| | Corentin Moutet | 6 | 6 | | | | | |
| | Corentin Moutet | 6 | 6 | | Corentin Moutet | 3 | 7$^7$ | 7 |
| | | | | 14/Alt | Alexei Popyrin | 6 | 6$^2$ | 5 |
| WC | Jack Sock | 2$^r$ | | 14/Alt | Alexei Popyrin | 6 | 6$^2$ | 5 |
| 14/Alt | Alexei Popyrin | 4 | | | | | | |

#### Seventh qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition |
| 7 | Lorenzo Musetti | 3 | 3 | | | | |
| | Kevin Anderson | 6 | 6 | | | | |
| | Kevin Anderson | 6 | 6 | | Kevin Anderson | 7$^7$ | 6 |
| | | | | | Steve Johnson | 6$^3$ | 4 |
| | Steve Johnson | 6$^4$ | 6 | 6 | Steve Johnson | 6$^3$ | 4 |
| 13 | Emil Ruusuvuori | 7$^7$ | 2 | 3 | | | |