# 2021 ABN AMRO World Tennis Tournament – Singles

Andrey Rublev defeated Márton Fucsovics in the final, 7–6$^{(7–4)}$, 6–4 to capture the men's singles tennis title at the 2021 Rotterdam Open. It was Rublev's fourth consecutive ATP Tour 500 victory, dating back to the 2020 Hamburg Open.
Gaël Monfils was the two-time defending champion, but chose not to defend his title.
Daniil Medvedev was in contention to become the first player outside of the Big Four to reach the world No. 2 ranking since July 24, 2005 if he reached the final. However, he lost in the first round to Dušan Lajović.

## Seeds

* Daniil Medvedev (first round)
* Stefanos Tsitsipas (semifinals)
* Alexander Zverev (first round)
* Andrey Rublev (champion)
* Roberto Bautista Agut (first round)
* David Goffin (second round)
* Félix Auger-Aliassime (first round)
* Stan Wawrinka (first round)

## 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

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Borna Ćorić | 4 | 1 | | | | |
| Q | Márton Fucsovics | 6 | 6 | | | | |
| Q | Márton Fucsovics | 6 | 6 | Q | Márton Fucsovics | 6$^4$ | 4 |
| | | | | 4 | Andrey Rublev | 7$^7$ | 6 |
| 4 | Andrey Rublev | 6 | 7$^7$ | 4 | Andrey Rublev | 7$^7$ | 6 |
| 2 | Stefanos Tsitsipas | 3 | 6$^2$ | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | D Medvedev | 6$^4$ | 4 | | | | | | | | | | | | | | |
| | D Lajović | 7$^7$ | 6 | | | D Lajović | 3 | 2 | | | | | | | | | |
| | B Ćorić | 6 | 7$^7$ | | | B Ćorić | 6 | 6 | | | | | | | | | |
| WC | B van de Zandschulp | 4 | 6$^4$ | | | | | | | | B Ćorić | 7$^7$ | 7$^7$ | | | | |
| | A de Minaur | 6 | 6 | | | | | | | | K Nishikori | 6$^2$ | 6$^4$ | | | | |
| | J Millman | 1 | 4 | | | A de Minaur | 3 | 6 | 5 | | | | | | | | |
| | K Nishikori | 7$^7$ | 6 | | | K Nishikori | 6 | 2 | 7 | | | | | | | | |
| 7 | F Auger-Aliassime | 6$^4$ | 1 | | | | | | | | | | | | B Ćorić | 4 | 1 |
| 3/WC | A Zverev | 5 | 3 | | | | | | | | | | | Q | M Fucsovics | 6 | 6 |
| | A Bublik | 7 | 6 | | | A Bublik | 7$^7$ | 3 | 1 | | | | | | | | |
| | T Paul | 6 | 7$^9$ | | | T Paul | 6$^5$ | 6 | 6 | | | | | | | | |
| | L Sonego | 4 | 6$^7$ | | | | | | | | T Paul | 4 | 3 | | | | |
| Q | M Fucsovics | 7$^7$ | 6$^4$ | 7$^7$ | | | | | | Q | M Fucsovics | 6 | 6 | | | | |
| | R Opelka | 6$^2$ | 7$^7$ | 6$^4$ | Q | M Fucsovics | 6 | 6 | | | | | | | | | |
| | A Davidovich Fokina | 6 | 7$^7$ | | | A Davidovich Fokina | 3 | 2 | | | | | | | | | |
| 5 | R Bautista Agut | 2 | 6$^3$ | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | D Goffin | 6 | 6 | | | | | | | | | | | | | | | |
| | J-L Struff | 4 | 0 | | 6 | D Goffin | 6$^3$ | 6$^5$ | | | | | | | | | | |
| Q | J Chardy | 4 | 7$^7$ | 7$^7$ | Q | J Chardy | 7$^7$ | 7$^7$ | | | | | | | | | | |
| | U Humbert | 6 | 6$^5$ | 6$^4$ | | | | | | Q | J Chardy | 6$^2$ | 7$^7$ | 4 | | | | |
| WC | R Haase | 6 | 6$^2$ | 3 | | | | | | 4 | A Rublev | 7$^7$ | 6$^2$ | 6 | | | | |
| WC | A Murray | 2 | 7$^7$ | 6 | WC | A Murray | 5 | 2 | | | | | | | | | | |
| Q | M Giron | 6$^1$ | 3 | | 4 | A Rublev | 7 | 6 | | | | | | | | | | |
| 4 | A Rublev | 7$^7$ | 6 | | | | | | | | | | | | 4 | A Rublev | 6 | 7$^7$ |
| 8 | S Wawrinka | 4 | 5 | | | | | | | | | | | | 2 | S Tsitsipas | 3 | 6$^2$ |
| | K Khachanov | 6 | 7 | | | K Khachanov | 6 | 6 | | | | | | | | | | |
| | N Basilashvili | 0 | 3 | | Q | C Norrie | 2 | 2 | | | | | | | | | | |
| Q | C Norrie | 6 | 6 | | | | | | | | K Khachanov | 6 | 3 | 5 | | | | |
| | H Hurkacz | 6 | 7$^8$ | | | | | | | 2 | S Tsitsipas | 4 | 6 | 7 | | | | |
| | A Mannarino | 3 | 6$^6$ | | | H Hurkacz | 4 | 6 | 5 | | | | | | | | | |
| SE | E Gerasimov | 6$^4$ | 5 | | 2 | S Tsitsipas | 6 | 4 | 7 | | | | | | | | | |
| 2 | S Tsitsipas | 7$^7$ | 7 | | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Márton Fucsovics (qualified)
* Jérémy Chardy (qualified)
* Cameron Norrie (qualified)
* Marcos Giron (qualified)
* Pierre-Hugues Herbert (qualifying competition)
* Norbert Gombos (qualifying competition)
* Andreas Seppi (qualifying competition)
* Antoine Hoang (qualifying competition)

### Qualifiers

* Márton Fucsovics
* Jérémy Chardy
* Cameron Norrie
* Marcos Giron

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Márton Fucsovics | 6 | 6 | | | | |
| | Arthur Rinderknech | 2 | 4 | | | | |
| | Arthur Rinderknech | 2 | 4 | 1 | Márton Fucsovics | 6 | 6 |
| | | | | 5 | Pierre-Hugues Herbert | 4 | 3 |
| | Václav Šafránek | 6$^4$ | 2 | 5 | Pierre-Hugues Herbert | 4 | 3 |
| 5 | Pierre-Hugues Herbert | 7$^7$ | 6 | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Jérémy Chardy | 6 | 4 | 6 | | | | | |
| | Tallon Griekspoor | 4 | 6 | 0 | | | | | |
| | Tallon Griekspoor | 4 | 6 | 0 | 2 | Jérémy Chardy | 6 | 5 | 6 |
| | | | | | 8 | Antoine Hoang | 4 | 7 | 4 |
| WC | Ryan Nijboer | 4 | 0 | | 8 | Antoine Hoang | 4 | 7 | 4 |
| 8 | Antoine Hoang | 6 | 6 | | | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Cameron Norrie | 6 | 6 | | | | |
| Alt | Miliaan Niesten | 2 | 0 | | | | |
| Alt | Miliaan Niesten | 2 | 0 | 3 | Cameron Norrie | 6 | 6 |
| | | | | 7 | Andreas Seppi | 3 | 2 |
| | Maxime Cressy | 4 | 1 | 7 | Andreas Seppi | 3 | 2 |
| 7 | Andreas Seppi | 6 | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Marcos Giron | 6 | 5 | 6 | | | | |
| WC | Tim van Rijthoven | 2 | 7 | 4 | | | | |
| WC | Tim van Rijthoven | 2 | 7 | 4 | 4 | Marcos Giron | 6 | 6 |
| | | | | | 6 | Norbert Gombos | 3 | 4 |
| WC | Jelle Sels | 3 | 6$^2$ | | 6 | Norbert Gombos | 3 | 4 |
| 6 | Norbert Gombos | 6 | 7$^7$ | | | | | |