# 2021 Halle Open – Singles

Ugo Humbert defeated Andrey Rublev in the final 6–3, 7–6$^{(7–4)}$, to win the singles tennis title at the 2021 Halle Open. Humbert's win earned him his third career ATP Tour singles title and his first ATP 500 victory, and also made him the first French player to win the tournament since Henri Leconte won the inaugural edition in 1993. Both Humbert and Rublev were contesting their first career final on grass.
Roger Federer was the defending champion from when the event was last held in 2019, but he lost in the second round to Félix Auger-Aliassime.

## Seeds

* Daniil Medvedev (first round)
* Stefanos Tsitsipas (withdrew)
* Alexander Zverev (second round)
* Andrey Rublev (final)
* Roger Federer (second round)
* Roberto Bautista Agut (first round)
* David Goffin (first round, retired)
* Gaël Monfils (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 | Semifinals | Final | Final | Final | Final |
| | Félix Auger-Aliassime | 4 | 6 | 6$^5$ | | | | |
| | Ugo Humbert | 6 | 3 | 7$^7$ | | | | |
| | Ugo Humbert | 6 | 3 | 7$^7$ | | Ugo Humbert | 6 | 7$^7$ |
| | | | | | 4 | Andrey Rublev | 3 | 6$^4$ |
| 4 | Andrey Rublev | 6 | 3 | 6 | 4 | Andrey Rublev | 3 | 6$^4$ |
| Q | Nikoloz Basilashvili | 1 | 6 | 3 | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | D Medvedev | 6$^6$ | 3 | | | | | | | | | | | | | | | |
| | J-L Struff | 7$^8$ | 6 | | | J-L Struff | 7$^7$ | 3 | 4 | | | | | | | | | |
| | V Pospisil | 6$^4$ | 6$^6$ | | Q | M Giron | 6$^1$ | 6 | 6 | | | | | | | | | |
| Q | M Giron | 7$^7$ | 7$^8$ | | | | | | | Q | M Giron | 3 | 2 | | | | | |
| | F Auger-Aliassime | 6 | 7 | | | | | | | | F Auger-Aliassime | 6 | 6 | | | | | |
| | H Hurkacz | 3 | 5 | | | F Auger-Aliassime | 4 | 6 | 6 | | | | | | | | | |
| Q | I Ivashka | 6$^4$ | 5 | | 5 | R Federer | 6 | 3 | 2 | | | | | | | | | |
| 5 | R Federer | 7$^7$ | 7 | | | | | | | | | | | | F Auger-Aliassime | 4 | 6 | 6$^5$ |
| 3 | A Zverev | 6 | 3 | 6 | | | | | | | | | | | U Humbert | 6 | 3 | 7$^7$ |
| | D Koepfer | 4 | 6 | 3 | 3 | A Zverev | 6$^4$ | 6 | 3 | | | | | | | | | |
| | U Humbert | 4 | 7$^7$ | 7$^7$ | | U Humbert | 7$^7$ | 3 | 6 | | | | | | | | | |
| | S Querrey | 6 | 6$^4$ | 6$^5$ | | | | | | | U Humbert | 6 | 6$^5$ | 6 | | | | |
| Q | R Berankis | 3 | 6 | 2 | | | | | | | S Korda | 2 | 7$^7$ | 4 | | | | |
| | K Nishikori | 6 | 2 | 6 | | K Nishikori | 6 | 3 | 5 | | | | | | | | | |
| | S Korda | 6 | 7$^7$ | | | S Korda | 2 | 6 | 7 | | | | | | | | | |
| 6 | R Bautista Agut | 3 | 6$^0$ | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | D Goffin | 6 | 5 | 0$^r$ | | | | | | | | | | | | | |
| | C Moutet | 1 | 7 | 0 | | C Moutet | 4 | 6$^4$ | | | | | | | | | |
| SE | J Rodionov | 4 | 3 | | WC | P Kohlschreiber | 6 | 7$^7$ | | | | | | | | | |
| WC | P Kohlschreiber | 6 | 6 | | | | | | WC | P Kohlschreiber | 6$^4$ | 2 | | | | | |
| | J Thompson | 6 | 7$^7$ | | | | | | 4 | A Rublev | 7$^7$ | 6 | | | | | |
| WC | D Altmaier | 2 | 6$^4$ | | | J Thompson | 4 | 4 | | | | | | | | | |
| | K Khachanov | 3 | 6$^5$ | | 4 | A Rublev | 6 | 6 | | | | | | | | | |
| 4 | A Rublev | 6 | 7$^7$ | | | | | | | | | | 4 | A Rublev | 6 | 3 | 6 |
| 8/WC | G Monfils | 4 | 4 | | | | | | | | | | Q | N Basilashvili | 1 | 6 | 3 |
| | L Harris | 6 | 6 | | | L Harris | 6 | 7$^{10}$ | | | | | | | | | |
| | G Pella | 7$^7$ | 5 | 1 | Q | L Lacko | 3 | 6$^8$ | | | | | | | | | |
| Q | L Lacko | 6$^5$ | 7 | 6 | | | | | | L Harris | 4 | 6$^5$ | | | | | |
| Q | N Basilashvili | 6 | 3 | 6 | | | | | Q | N Basilashvili | 6 | 7$^7$ | | | | | |
| | G Simon | 1 | 6 | 4 | Q | N Basilashvili | 6 | 7 | | | | | | | | | |
| Q | A Rinderknech | 7 | 6 | | Q | A Rinderknech | 2 | 5 | | | | | | | | | |
| LL | Y Hanfmann | 5 | 3 | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Nikoloz Basilashvili (qualified)
* Egor Gerasimov (first round)
* Marcos Giron (qualified)
* Radu Albot (first round)
* Ilya Ivashka (qualified)
* Ričardas Berankis (qualified)
* Yannick Hanfmann (qualifying competition, lucky loser)
* James Duckworth (qualifying competition)
* Daniel Elahi Galán (qualifying competition)
* Dennis Novak (qualifying competition)
* João Sousa (qualifying competition)
* Arthur Rinderknech (qualified)

### Qualifiers

* Nikoloz Basilashvili
* Lukáš Lacko
* Marcos Giron
* Arthur Rinderknech
* Ilya Ivashka
* Ričardas Berankis

### Lucky loser

* Yannick Hanfmann

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Nikoloz Basilashvili | 7$^9$ | 7$^7$ | | | | | |
| WC | Rudolf Molleker | 6$^7$ | 6$^5$ | | | | | |
| WC | Rudolf Molleker | 6$^7$ | 6$^5$ | | 1 | Nikoloz Basilashvili | 7$^7$ | 6 |
| | | | | | 7 | Yannick Hanfmann | 6$^3$ | 4 |
| | Alexandre Müller | 6 | 0 | 5 | 7 | Yannick Hanfmann | 6$^3$ | 4 |
| 7 | Yannick Hanfmann | 2 | 6 | 7 | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Egor Gerasimov | 4 | 5 | | | | | | |
| PR | Lukáš Lacko | 6 | 7 | | | | | | |
| PR | Lukáš Lacko | 6 | 7 | | PR | Lukáš Lacko | 4 | 6 | 6 |
| | | | | | 11 | João Sousa | 6 | 4 | 3 |
| | Grégoire Barrère | 6 | 6$^5$ | 4 | 11 | João Sousa | 6 | 4 | 3 |
| 11 | João Sousa | 3 | 7$^7$ | 6 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Marcos Giron | 6 | 7 | | | | | |
| WC | Dominic Stricker | 4 | 5 | | | | | |
| WC | Dominic Stricker | 4 | 5 | | 3 | Marcos Giron | 6 | 7$^7$ |
| | | | | | 9 | Daniel Elahi Galán | 4 | 6$^5$ |
| WC | Nicola Kuhn | 6$^2$ | 6 | 6$^4$ | 9 | Daniel Elahi Galán | 4 | 6$^5$ |
| 9 | Daniel Elahi Galán | 7$^7$ | 4 | 7$^7$ | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Radu Albot | 6 | 3 | 5 | | | | | |
| | Christopher O'Connell | 4 | 6 | 7 | | | | | |
| | Christopher O'Connell | 4 | 6 | 7 | | Christopher O'Connell | 6 | 4 | 2 |
| | | | | | 12 | Arthur Rinderknech | 3 | 6 | 6 |
| | Sergiy Stakhovsky | 4 | 4 | | 12 | Arthur Rinderknech | 3 | 6 | 6 |
| 12 | Arthur Rinderknech | 6 | 6 | | | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Ilya Ivashka | 6 | 6 | | | | | | |
| PR | Tatsuma Ito | 1 | 3 | | | | | | |
| PR | Tatsuma Ito | 1 | 3 | | 5 | Ilya Ivashka | 2 | 6 | 6 |
| | | | | | 8 | James Duckworth | 6 | 4 | 0 |
| | Ernests Gulbis | 7 | 5 | 2 | 8 | James Duckworth | 6 | 4 | 0 |
| 8 | James Duckworth | 5 | 7 | 6 | | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6/Alt | Ričardas Berankis | 6 | 2 | | | | |
| | Cedrik-Marcel Stebe | 4 | 1$^r$ | | | | |
| | Cedrik-Marcel Stebe | 4 | 1$^r$ | 6/Alt | Ričardas Berankis | 6 | 6 |
| | | | | 10 | Dennis Novak | 4 | 3 |
| | Yannick Maden | 4 | 0$^r$ | 10 | Dennis Novak | 4 | 3 |
| 10 | Dennis Novak | 6 | 0 | | | | |