# 2021 Play In Challenger – Singles

Grégoire Barrère was the defending champion but lost in the final to Zizou Bergs.
Bergs won the title after defeating Barrère 4–6, 6–1, 7–6$^{(7–5)}$ in the final.

## Seeds

* Grégoire Barrère (final)
* Benjamin Bonzi (quarterfinals)
* Arthur Rinderknech (quarterfinals)
* Antoine Hoang (second round)
* Oscar Otte (first round)
* Alexandre Müller (first round)
* Maximilian Marterer (first round)
* Quentin Halys (semifinals)

## 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 | Final |
| 1 | Grégoire Barrère | 4 | 7 | 6 | | | | | |
| | Maxime Janvier | 6 | 5 | 2 | | | | | |
| | Maxime Janvier | 6 | 5 | 2 | 1 | Grégoire Barrère | 6 | 1 | 6$^5$ |
| | | | | | Q | Zizou Bergs | 4 | 6 | 7$^7$ |
| Q | Zizou Bergs | 1 | 6 | 6 | Q | Zizou Bergs | 4 | 6 | 7$^7$ |
| 8 | Quentin Halys | 6 | 3 | 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 | Semifinals |
| 1 | G Barrère | 6 | 6$^5$ | 6 | | | | | | | | | | | | | | | |
| | V Šafránek | 4 | 7$^7$ | 0 | 1 | G Barrère | 6 | 7 | | | | | | | | | | | |
| | M Bourgue | 7$^7$ | 6$^2$ | 4 | PR | D Brown | 3 | 5 | | | | | | | | | | | |
| PR | D Brown | 6$^2$ | 7$^7$ | 6 | | | | | | 1 | G Barrère | 6$^6$ | 6 | 7$^7$ | | | | | |
| | P Cachin | 2 | 6 | 3 | | | | | | | J Forejtek | 7$^8$ | 3 | 6$^4$ | | | | | |
| | J Forejtek | 6 | 4 | 6 | | J Forejtek | 6 | 6 | | | | | | | | | | | |
| | G Zeppieri | 7$^7$ | 6 | | | G Zeppieri | 3 | 4 | | | | | | | | | | | |
| 5 | O Otte | 6$^3$ | 3 | | | | | | | | | | | | 1 | G Barrère | 4 | 7 | 6 |
| 3 | A Rinderknech | 6 | 5 | 6 | | | | | | | | | | | | M Janvier | 6 | 5 | 2 |
| | M Geerts | 3 | 7 | 3 | 3 | A Rinderknech | 6 | 6 | | | | | | | | | | | |
| Q | M Martineau | 3 | 2 | | | N Kuhn | 3 | 1 | | | | | | | | | | | |
| | N Kuhn | 6 | 6 | | | | | | | 3 | A Rinderknech | 4 | 6$^5$ | | | | | | |
| | M Janvier | 3 | 6 | 6 | | | | | | | M Janvier | 6 | 7$^7$ | | | | | | |
| | V Durasovic | 6 | 3 | 2 | | M Janvier | 6$^5$ | 6 | 6 | | | | | | | | | | |
| LL | FC Jianu | 2 | 6 | 7 | LL | FC Jianu | 7$^7$ | 3 | 3 | | | | | | | | | | |
| 6 | A Müller | 6 | 2 | 5 | | | | | | | | | | | | | | | |

### 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 | Semifinals |
| 7 | M Marterer | 4 | 1 | | | | | | | | | | | | | | | |
| Q | Z Bergs | 6 | 6 | | Q | Z Bergs | 6 | 3 | 6 | | | | | | | | | |
| | T Kamke | 7 | 6 | | | T Kamke | 3 | 6 | 3 | | | | | | | | | |
| | M Moraing | 5 | 3 | | | | | | | Q | Z Bergs | 4 | | | | | | |
| | A Arnaboldi | 7$^7$ | 6 | | | | | | | | A Arnaboldi | 2$^r$ | | | | | | |
| | M Guinard | 6$^3$ | 0 | | | A Arnaboldi | 6 | 5 | 6 | | | | | | | | | |
| Alt | M Hamou | 1 | 3 | | 4 | A Hoang | 2 | 7 | 3 | | | | | | | | | |
| 4 | A Hoang | 6 | 6 | | | | | | | | | | | Q | Z Bergs | 1 | 6 | 6 |
| 8 | Q Halys | 6 | 6 | | | | | | | | | | | 8 | Q Halys | 6 | 3 | 3 |
| WC | A Cazaux | 3 | 2 | | 8 | Q Halys | 6 | 7 | | | | | | | | | | |
| Q | Baptiste Crepatte | 2 | 4 | | WC | L Marmousez | 3 | 5 | | | | | | | | | | |
| WC | Lilian Marmousez | 6 | 6 | | | | | | | 8 | Q Halys | 6 | 6 | | | | | |
| | T Lamasine | 4 | 6 | 6 | | | | | | 2 | B Bonzi | 4 | 3 | | | | | |
| Q | Jurgen Briand | 6 | 3 | 4 | | T Lamasine | 4 | 3 | | | | | | | | | | |
| WC | E Furness | 7 | 4 | 3 | 2 | B Bonzi | 6 | 6 | | | | | | | | | | |
| 2 | B Bonzi | 5 | 6 | 6 | | | | | | | | | | | | | | |