# 2021 Challenger Biel/Bienne – Singles

This was the first edition of the tournament.
Liam Broady won the title after defeating Marc-Andrea Hüsler 7–5, 6–3 in the final.

## Seeds

* Pierre-Hugues Herbert (withdrew)
* Henri Laaksonen (second round)
* Dennis Novak (second round)
* Tomáš Macháč (first round)
* Liam Broady (champion)
* João Sousa (quarterfinals)
* Marc-Andrea Hüsler (final)
* Cem İlkel (second 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 |
| 7 | Marc-Andrea Hüsler | 3 | 7$^{12}$ | 6 | | | | |
| | Tim van Rijthoven | 6 | 6$^{10}$ | 4 | | | | |
| | Tim van Rijthoven | 6 | 6$^{10}$ | 4 | 7 | Marc-Andrea Hüsler | 5 | 3 |
| | | | | | 5 | Liam Broady | 7 | 6 |
| 5 | Liam Broady | 6 | 2 | | 5 | Liam Broady | 7 | 6 |
| WC | Dominic Stricker | 0 | 0$^r$ | | | | | |

### 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 | Semifinals |
| LL | A Shevchenko | 7$^7$ | 6 | | | | | | | | | | | | | | | | |
| | G Soeda | 6$^1$ | 4 | | LL | A Shevchenko | 4 | 6$^3$ | | | | | | | | | | | |
| Q | A Escoffier | 6 | 6 | | Q | A Escoffier | 6 | 7$^7$ | | | | | | | | | | | |
| WC | J Kym | 4 | 1 | | | | | | | Q | A Escoffier | 7 | 1 | 2 | | | | | |
| WC | L Riedi | 2 | 6 | 0 | | | | | | 7 | M-A Hüsler | 5 | 6 | 6 | | | | | |
| | E Couacaud | 6 | 4 | 6 | | E Couacaud | 4 | 4 | | | | | | | | | | | |
| | R Bemelmans | 3 | 6 | 6$^5$ | 7 | M-A Hüsler | 6 | 6 | | | | | | | | | | | |
| 7 | M-A Hüsler | 6 | 3 | 7$^7$ | | | | | | | | | | | 7 | M-A Hüsler | 3 | 7$^{12}$ | 6 |
| 3 | D Novak | 6 | 6 | | | | | | | | | | | | | T van Rijthoven | 6 | 6$^{10}$ | 4 |
| Alt | M Bachinger | 4 | 2 | | 3 | D Novak | 7$^7$ | 3 | 6$^1$ | | | | | | | | | | |
| | T van Rijthoven | 6 | 6 | | | T van Rijthoven | 6$^5$ | 6 | 7$^7$ | | | | | | | | | | |
| Q | H Moriya | 1 | 3 | | | | | | | | T van Rijthoven | 7$^7$ | 6 | | | | | | |
| Q | J Paul | 4 | 4 | | | | | | | 6 | J Sousa | 6$^4$ | 4 | | | | | | |
| Q | A Ritschard | 6 | 6 | | Q | A Ritschard | 3 | 2 | | | | | | | | | | | |
| | B Gojo | 5 | 5 | | 6 | J Sousa | 6 | 6 | | | | | | | | | | | |
| 6 | J Sousa | 7 | 7 | | | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | L Broady | 7 | 6 | | | | | | | | | | | | | | |
| Alt | A Kuznetsov | 5 | 3 | | 5 | L Broady | 6 | 6 | | | | | | | | | |
| | D Masur | 6 | 4 | 3 | | H Grenier | 4 | 3 | | | | | | | | | |
| | H Grenier | 3 | 6 | 6 | | | | | | 5 | L Broady | 7$^7$ | 6 | | | | |
| | L Klein | 7 | 4 | 4 | | | | | | | R Ramanathan | 6$^2$ | 2 | | | | |
| | M Moraing | 5 | 6 | 6 | | M Moraing | 2 | 3 | | | | | | | | | |
| | R Ramanathan | 6 | 6 | | | R Ramanathan | 6 | 6 | | | | | | | | | |
| 4 | T Macháč | 3 | 2 | | | | | | | | | | | 5 | L Broady | 6 | 2 |
| 8 | C İlkel | 7$^7$ | 7$^7$ | | | | | | | | | | | WC | D Stricker | 0 | 0$^r$ |
| | M Viola | 6$^3$ | 6$^1$ | | 8 | C İlkel | 4 | 6$^3$ | | | | | | | | | |
| | T Kamke | 6 | 7$^7$ | | | T Kamke | 6 | 7$^7$ | | | | | | | | | |
| | D Kuzmanov | 4 | 6$^0$ | | | | | | | | T Kamke | 4 | 4 | | | | |
| | M Janvier | 4 | 5 | | | | | | | WC | D Stricker | 6 | 6 | | | | |
| WC | D Stricker | 6 | 7 | | WC | D Stricker | 6 | 4 | 6 | | | | | | | | |
| | L Lacko | 5 | 2 | | 2 | H Laaksonen | 1 | 6 | 3 | | | | | | | | |
| 2 | H Laaksonen | 7 | 6 | | | | | | | | | | | | | | |