# 2021 Engie Open de Biarritz – Singles

The 2021 Engie Open de Biarritz – Singles was the singles event in the 18th edition of the Engie Open de Biarritz, a professional women's tennis tournament played on outdoor clay courts.
Viktoriya Tomova was the defending champion, having won the previous edition in 2019, however she chose to compete in Budapest instead.
Francesca Jones won the title, defeating Oksana Selekhmeteva in the final, 6–4, 7–6$^{(7–4)}$.

## Seeds

* Francesca Jones (champion)
* Tessah Andrianjafitrimo (first round)
* Daniela Seguel (first round)
* Amandine Hesse (second round)
* Ana Sofía Sánchez (first round)
* Richèl Hogenkamp (second round)
* Chloé Paquet (second round)
* Elitsa Kostova (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 | Final | Final | Final | Final |
| 1 | Francesca Jones | 6 | 6 | | | | |
| | Stephanie Wagner | 4 | 1 | | | | |
| | Stephanie Wagner | 4 | 1 | 1 | Francesca Jones | 6 | 7$^7$ |
| | | | | Q | Oksana Selekhmeteva | 4 | 6$^4$ |
| | Lucrezia Stefanini | 3 | 5 | Q | Oksana Selekhmeteva | 4 | 6$^4$ |
| Q | Oksana Selekhmeteva | 6 | 7 | | | | |

### Top 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 |
| 1 | F Jones | 6 | 6 | | | | | | | | | | | | | |
| Q | A Carreras | 2 | 4 | | 1 | F Jones | 7$^{13}$ | 6 | | | | | | | | |
| Q | A Gabric | 6 | 3 | 3 | WC | M Rouvroy | 6$^{11}$ | 0 | | | | | | | | |
| WC | M Rouvroy | 4 | 6 | 6 | | | | | 1 | F Jones | 6 | 6 | | | | |
| | M Yerolymos | 6 | 6 | | | | | | | A Hartono | 4 | 1 | | | | |
| Q | A Robbe | 4 | 4 | | | M Yerolymos | 2 | 3 | | | | | | | | |
| | A Hartono | 6 | 6 | | | A Hartono | 6 | 6 | | | | | | | | |
| 5 | AS Sánchez | 0 | 2 | | | | | | | | | | 1 | F Jones | 6 | 6 |
| 3 | D Seguel | 1 | 1 | | | | | | | | | | | S Wagner | 4 | 1 |
| Q | J Garland | 6 | 6 | | Q | J Garland | 1 | 2 | | | | | | | | |
| | S Wagner | 6 | 6 | | | S Wagner | 6 | 6 | | | | | | | | |
| | K Stewart | 0 | 1 | | | | | | | S Wagner | 6 | 6 | | | | |
| WC | L Tholey | 2 | 1 | | | | | | Q | L Jeanjean | 2 | 4 | | | | |
| Q | L Jeanjean | 6 | 6 | | Q | L Jeanjean | 6 | 6 | | | | | | | | |
| JE | E Navarro | 4 | 3 | | 6 | R Hogenkamp | 2 | 4 | | | | | | | | |
| 6 | R Hogenkamp | 6 | 6 | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | C Paquet | 6 | 6 | | | | | | | | | | | | | | | |
| WC | L Boisson | 4 | 2 | | 7 | C Paquet | 3 | 6 | 6$^2$ | | | | | | | | | |
| | D Parry | 1 | 4 | | | L Stefanini | 6 | 3 | 7$^7$ | | | | | | | | | |
| | L Stefanini | 6 | 6 | | | | | | | | L Stefanini | 4 | 6 | 7 | | | | |
| PR | L Chirico | 6 | 6$^9$ | 4 | | | | | | | S Mendez | 6 | 3 | 5 | | | | |
| | S Mendez | 1 | 7$^{11}$ | 6 | | S Mendez | 6 | 3 | 6 | | | | | | | | | |
| | G Maristany | 3 | 5 | | 4 | A Hesse | 4 | 6 | 4 | | | | | | | | | |
| 4 | A Hesse | 6 | 7 | | | | | | | | | | | | | L Stefanini | 3 | 5 |
| 8 | E Kostova | 4 | 3 | | | | | | | | | | | | Q | O Selekhmeteva | 6 | 7 |
| Q | E Cascino | 6 | 6 | | Q | E Cascino | 3 | 3 | | | | | | | | | | |
| Q | T Pieri | 1 | 6 | 0 | | D Vismane | 6 | 6 | | | | | | | | | | |
| | D Vismane | 6 | 4 | 6 | | | | | | | D Vismane | 1 | 4 | | | | | |
| WC | S Janicijevic | 5 | 1 | | | | | | | Q | O Selekhmeteva | 6 | 6 | | | | | |
| Q | O Selekhmeteva | 7 | 6 | | Q | O Selekhmeteva | 6 | 7$^7$ | | | | | | | | | | |
| | A Ramé | 4 | 6 | 6 | | A Ramé | 1 | 6$^4$ | | | | | | | | | | |
| 2 | T Andrianjafitrimo | 6 | 4 | 4 | | | | | | | | | | | | | | |