# 2021 Open du Pays d'Aix – Singles

Oscar Otte was the defending champion but retired in the quarterfinals to Elias Ymer.
Carlos Taberner won the title after defeating Manuel Guinard 6–2, 6–2 in the final.

## Seeds

* Roberto Carballés Baena (second round)
* Fernando Verdasco (first round)
* Facundo Bagnis (second round)
* Francisco Cerúndolo (second round)
* Juan Pablo Varillas (second round)
* Carlos Taberner (champion)
* Hugo Gaston (second round)
* Sumit Nagal (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 |
| | Manuel Guinard | 6 | 6 | | | | | |
| | Elias Ymer | 4 | 2 | | | | | |
| | Elias Ymer | 4 | 2 | | | Manuel Guinard | 2 | 2 |
| | | | | | 6 | Carlos Taberner | 6 | 6 |
| 6 | Carlos Taberner | 6 | 6$^7$ | 6 | 6 | Carlos Taberner | 6 | 6 |
| WC | Kyrian Jacquet | 3 | 7$^9$ | 0 | | | | |

### 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 |
| 1 | R Carballés Baena | 6 | 6 | | | | | | | | | | | | | |
| WC | M Martineau | 3 | 1 | | 1 | R Carballés Baena | 6$^5$ | 4 | | | | | | | | |
| Q | N Sánchez Izquierdo | 6 | 3 | 4 | | M Guinard | 7$^7$ | 6 | | | | | | | | |
| | M Guinard | 3 | 6 | 6 | | | | | | M Guinard | 6$^4$ | 6 | 6 | | | |
| | J Domingues | 6$^2$ | 4 | | | | | | | T Lamasine | 7$^7$ | 3 | 3 | | | |
| | B Fratangelo | 7$^7$ | 6 | | | B Fratangelo | 5 | 3 | | | | | | | | |
| | T Lamasine | 4 | 7$^7$ | 6 | | T Lamasine | 7 | 6 | | | | | | | | |
| 8 | S Nagal | 6 | 6$^5$ | 1 | | | | | | | | | | M Guinard | 6 | 6 |
| 4 | F Cerúndolo | 6 | 4 | 6 | | | | | | | | | | E Ymer | 4 | 2 |
| Alt | G Blancaneaux | 2 | 6 | 4 | 4 | F Cerúndolo | 7$^9$ | 2 | 4 | | | | | | | |
| | E Ymer | 6 | 7$^7$ | | | E Ymer | 6$^7$ | 6 | 6 | | | | | | | |
| | M Viola | 4 | 6$^3$ | | | | | | | E Ymer | 6 | 0 | | | | |
| | O Otte | 6 | 6 | | | | | | | O Otte | 0 | 0$^r$ | | | | |
| Q | A Dougaz | 4 | 1 | | | O Otte | 6 | 4 | 6 | | | | | | | |
| | T Robredo | 6 | 1 | 0 | 7 | H Gaston | 4 | 6 | 3 | | | | | | | |
| 7 | H Gaston | 2 | 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 | Semifinals |
| 6 | C Taberner | 6 | 6 | | | | | | | | | | | | | | |
| | A Vatutin | 4 | 1 | | 6 | C Taberner | 7$^7$ | 6 | | | | | | | | | |
| WC | A Cazaux | 6 | 6 | | WC | A Cazaux | 6$^5$ | 2 | | | | | | | | | |
| Alt | A Velotti | 3 | 0 | | | | | | 6 | C Taberner | 6 | 6 | | | | | |
| | R Olivo | 7$^7$ | 6 | | | | | | | R Olivo | 3 | 1 | | | | | |
| LL | Oscar José Gutierrez | 6$^3$ | 4 | | | R Olivo | 6 | 6 | | | | | | | | | |
| Alt | J Barranco Cosano | 3 | 6 | 1 | 3 | F Bagnis | 2 | 4 | | | | | | | | | |
| 3 | F Bagnis | 6 | 1 | 6 | | | | | | | | | 6 | C Taberner | 6 | 6$^7$ | 6 |
| 5 | JP Varillas | 6 | 6 | | | | | | | | | | WC | K Jacquet | 3 | 7$^9$ | 0 |
| | A Collarini | 4 | 4 | | 5 | JP Varillas | 4 | 3 | | | | | | | | | |
| | M Janvier | 3 | 6$^2$ | | WC | K Jacquet | 6 | 6 | | | | | | | | | |
| WC | K Jacquet | 6 | 7$^7$ | | | | | | WC | K Jacquet | 7 | 6 | | | | | |
| Q | T Droguet | 6 | 6 | | | | | | Q | T Droguet | 5 | 3 | | | | | |
| Q | O Roca Batalla | 3 | 4 | | Q | T Droguet | 6 | 6 | | | | | | | | | |
| | M Bourgue | 7$^7$ | 4 | 6 | | M Bourgue | 4 | 1 | | | | | | | | | |
| 2 | F Verdasco | 6$^3$ | 6 | 2 | | | | | | | | | | | | | |