# 2021 BMW Open – Singles

Nikoloz Basilashvili defeated Jan-Lennard Struff in the final, 6–4, 7–6$^{(7–5)}$ to win the men's singles tennis title at the 2021 Bavarian International Tennis Championships. After not dropping a set en route to his victory, Basilashvili earned his second title of the season and his fifth career ATP Tour singles title overall. Struff was in contention to win his first title in his first tour-level final.
Cristian Garín was the defending champion from when the tournament was last held in 2019, but he competed at the simultaneous Estoril Open instead.

## Seeds

The top four seeds received a bye into the second round.
* Alexander Zverev (quarterfinals)
* Casper Ruud (semifinals)
* Aslan Karatsev (withdrew)
* Filip Krajinović (quarterfinals)
* Nikoloz Basilashvili (champion)
* Dušan Lajović (first round)
* Jan-Lennard Struff (final)
* John Millman (quarterfinals)

## 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 |
| Q | Ilya Ivashka | 4 | 1 | | | | |
| 7 | Jan-Lennard Struff | 6 | 6 | | | | |
| 7 | Jan-Lennard Struff | 6 | 6 | 7 | Jan-Lennard Struff | 4 | 6$^5$ |
| | | | | 5 | Nikoloz Basilashvili | 6 | 7$^7$ |
| 5 | Nikoloz Basilashvili | 6 | 6 | 5 | Nikoloz Basilashvili | 6 | 7$^7$ |
| 2 | Casper Ruud | 1 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | A Zverev | 6 | 6 | | | | | | | | | | |
| LL | R Berankis | 7$^{12}$ | 6 | | LL | R Berankis | 2 | 4 | | | | | | | | | | |
| WC | M Marterer | 6$^{10}$ | 3 | | | | | | | 1 | A Zverev | 7$^7$ | 5 | 3 | | | | |
| | E Ruusuvuori | 1 | 2 | | | | | | | Q | I Ivashka | 6$^5$ | 7 | 6 | | | | |
| Q | I Ivashka | 6 | 6 | | Q | I Ivashka | 6$^7$ | 6 | 6 | | | | | | | | | |
| Q | M McDonald | 6 | 6 | | Q | M McDonald | 7$^9$ | 1 | 2 | | | | | | | | | |
| 6 | D Lajović | 4 | 4 | | | | | | | | | | | | Q | I Ivashka | 4 | 1 |
| | | | | | | | | | | | | | | | 7 | J-L Struff | 6 | 6 |
| | | | | | 4 | F Krajinović | w/o | | | | | | | | | | | |
| SE | T Daniel | 2 | 6 | 6$^5$ | WC | Y Hanfmann | | | | | | | | | | | | |
| WC | Y Hanfmann | 6 | 3 | 7$^7$ | | | | | | 4 | F Krajinović | 4 | 6 | 6$^3$ | | | | |
| | D Koepfer | 4 | 6 | 6 | | | | | | 7 | J-L Struff | 6 | 4 | 7$^7$ | | | | |
| WC | P Kohlschreiber | 6 | 4 | 3 | | D Koepfer | 6$^3$ | 7$^7$ | 2 | | | | | | | | | |
| LL | A Martin | 4 | 3 | | 7 | J-L Struff | 7$^7$ | 6$^0$ | 6 | | | | | | | | | |
| 7 | J-L Struff | 6 | 6 | | | | | | | | | | | | | | | |

### 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 |
| 5 | N Basilashvili | 6 | 6 | | | | | | | | | | | | | |
| | T Monteiro | 2 | 3 | | 5 | N Basilashvili | 6 | 6 | | | | | | | | |
| Q | DE Galán | 6 | 7$^9$ | | Q | DE Galán | 4 | 2 | | | | | | | | |
| | S Korda | 1 | 6$^7$ | | | | | | 5 | N Basilashvili | 6 | 6 | | | | |
| Q | C-M Stebe | 3 | 6 | 2 | | | | | LL | N Gombos | 4 | 4 | | | | |
| | F Coria | 6 | 3 | 6 | | F Coria | 4 | 1 | | | | | | | | |
| | | | | | LL | N Gombos | 6 | 6 | | | | | | | | |
| | | | | | | | | | | | | | 5 | N Basilashvili | 6 | 6 |
| 8 | J Millman | 7$^7$ | 3 | 7 | | | | | | | | | 2 | C Ruud | 1 | 2 |
| | A Popyrin | 6$^3$ | 6 | 5 | 8 | J Millman | 4 | 2 | | | | | | | | |
| | G Pella | 6 | 2 | | | G Pella | 6 | 0$^r$ | | | | | | | | |
| | E Gerasimov | 0 | 0$^r$ | | | | | | 8 | J Millman | 3 | 4 | | | | |
| | P Cuevas | 7$^7$ | 0 | 6 | | | | | 2 | C Ruud | 6 | 6 | | | | |
| | T Sandgren | 6$^4$ | 6 | 1 | | P Cuevas | 3 | 2 | | | | | | | | |
| | | | | | 2 | C Ruud | 6 | 6 | | | | | | | | |

## Qualifying
### Seeds

* Ričardas Berankis (qualifying competition, lucky loser)
* Norbert Gombos (qualifying competition, lucky loser)
* Andrej Martin (qualifying competition, lucky loser)
* Yūichi Sugita (first round)
* Dennis Novak (qualifying competition)
* Ilya Ivashka (qualified)
* Daniel Elahi Galán (qualified)
* Mackenzie McDonald (qualified)

### Qualifiers

* Ilya Ivashka
* Daniel Elahi Galán
* Mackenzie McDonald
* Cedrik-Marcel Stebe

### Lucky losers

* Ričardas Berankis
* Norbert Gombos
* Andrej Martin

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Ričardas Berankis | 1 | 6 | 6 | | | | | |
| WC | Max Hans Rehberg | 6 | 3 | 4 | | | | | |
| WC | Max Hans Rehberg | 6 | 3 | 4 | 1 | Ričardas Berankis | 2 | 6 | 0 |
| | | | | | 6 | Ilya Ivashka | 6 | 3 | 6 |
| | Kamil Majchrzak | 4 | 6$^5$ | | 6 | Ilya Ivashka | 6 | 3 | 6 |
| 6 | Ilya Ivashka | 6 | 7$^7$ | | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Norbert Gombos | 6 | 6$^2$ | 6 | | | | |
| | Sumit Nagal | 4 | 7$^7$ | 1 | | | | |
| | Sumit Nagal | 4 | 7$^7$ | 1 | 2 | Norbert Gombos | 3 | 4 |
| | | | | | 7 | Daniel Elahi Galán | 6 | 6 |
| WC | Mischa Zverev | 3 | 3 | | 7 | Daniel Elahi Galán | 6 | 6 |
| 7 | Daniel Elahi Galán | 6 | 6 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Andrej Martin | 6 | 6 | | | | |
| | Jurij Rodionov | 1 | 1 | | | | |
| | Jurij Rodionov | 1 | 1 | 3 | Andrej Martin | 3 | 2 |
| | | | | 8 | Mackenzie McDonald | 6 | 6 |
| | Peter Gojowczyk | 1 | 2 | 8 | Mackenzie McDonald | 6 | 6 |
| 8 | Mackenzie McDonald | 6 | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Yūichi Sugita | 4 | 3 | | | | | |
| | Cedrik-Marcel Stebe | 6 | 6 | | | | | |
| | Cedrik-Marcel Stebe | 6 | 6 | | | Cedrik-Marcel Stebe | 6 | 7 |
| | | | | | 5 | Dennis Novak | 4 | 5 |
| | Prajnesh Gunneswaran | 4 | 6 | 5 | 5 | Dennis Novak | 4 | 5 |
| 5 | Dennis Novak | 6 | 3 | 7 | | | | |