# 2018 Engie Open de Biarritz – Singles

The 2018 Engie Open de Biarritz – Singles was the singles event of the Open de Biarritz, a professional women's tennis tournament played on outdoor clay courts in the city of Biarritz, in France.
Mihaela Buzărnescu was the defending champion but chose not to participate.
Tamara Korpatsch won the title, defeating Timea Bacsinszky in the final, 6–2, 7–5.

## Seeds

* Carina Witthöft (second round)
* Sabina Sharipova (first round, retired)
* Ysaline Bonaventure (quarterfinals)
* Anhelina Kalinina (quarterfinals)
* Irina Bara (second round)
* Laura Siegemund (first round)
* Conny Perrin (second round)
* Irina Khromacheva (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 |
| WC | Timea Bacsinszky | 7 | 6 | | | | |
| SE | Paula Ormaechea | 5 | 3 | | | | |
| SE | Paula Ormaechea | 5 | 3 | WC | Timea Bacsinszky | 2 | 5 |
| | | | | | Tamara Korpatsch | 6 | 7 |
| | Tereza Smitková | 4 | 5 | | Tamara Korpatsch | 6 | 7 |
| | Tamara Korpatsch | 6 | 7 | | | | |

### 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 | Semifinals |
| 1 | C Witthöft | 6 | 7$^7$ | | | | | | | | | | | | | | |
| | E Kostova | 4 | 6$^2$ | | 1 | C Witthöft | 6$^5$ | 6$^2$ | | | | | | | | | |
| WC | M Georges | 3 | 3 | | Q | R Šramková | 7$^7$ | 7$^7$ | | | | | | | | | |
| Q | R Šramková | 6 | 6 | | | | | | | Q | R Šramková | 2 | 2$^r$ | | | | |
| WC | T Bacsinszky | 5 | 6 | 6 | | | | | | WC | T Bacsinszky | 6 | 1 | | | | |
| | K Zavatska | 7 | 3 | 2 | WC | T Bacsinszky | 6 | 7 | | | | | | | | | |
| | V Ivakhnenko | 4 | 4 | | 5 | I Bara | 2 | 5 | | | | | | | | | |
| 5 | I Bara | 6 | 6 | | | | | | | | | | | WC | T Bacsinszky | 7 | 6 |
| 3 | Y Bonaventure | 7$^7$ | 6 | | | | | | | | | | | SE | P Ormaechea | 5 | 3 |
| | J Ponchet | 6$^2$ | 1 | | 3 | Y Bonaventure | 7 | 6$^3$ | 7$^8$ | | | | | | | | |
| | Ç Büyükakçay | 6 | 6 | | | Ç Büyükakçay | 5 | 7$^7$ | 6$^6$ | | | | | | | | |
| | J Čepelová | 4 | 3 | | | | | | | 3 | Y Bonaventure | 4 | 4 | | | | |
| | V Cepede Royg | 6 | 4 | 4 | | | | | | SE | P Ormaechea | 6 | 6 | | | | |
| SE | P Ormaechea | 4 | 6 | 6 | SE | P Ormaechea | 7 | 6 | | | | | | | | | |
| | E Gorgodze | 6 | 6$^8$ | 6 | | E Gorgodze | 5 | 4 | | | | | | | | | |
| 8 | I Khromacheva | 3 | 7$^{10}$ | 0 | | | | | | | | | | | | | |

### 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 |
| 7 | C Perrin | 6 | 2 | 6 | | | | | | | | | | | | |
| PR | A Panova | 3 | 6 | 2 | 7 | C Perrin | 3 | 6 | 3 | | | | | | | |
| Q | M Partaud | 6 | 3 | 2 | | T Smitková | 6 | 4 | 6 | | | | | | | |
| | T Smitková | 1 | 6 | 6 | | | | | | | T Smitková | 7 | 6 | | | |
| | A Bolsova Zadoinov | 4 | 6 | 6 | | | | | | 4 | A Kalinina | 5 | 3 | | | |
| | K von Deichmann | 6 | 2 | 3 | | A Bolsova Zadoinov | 6 | 5 | 2 | | | | | | | |
| WC | C Paquet | 0 | 3 | | 4 | A Kalinina | 4 | 7 | 6 | | | | | | | |
| 4 | A Kalinina | 6 | 6 | | | | | | | | | | | T Smitková | 4 | 5 |
| 6 | L Siegemund | 6 | 4 | 6$^0$ | | | | | | | | | | T Korpatsch | 6 | 7 |
| Q | I Shinikova | 3 | 6 | 7$^7$ | Q | I Shinikova | 4 | 6 | 3 | | | | | | | |
| SE | K Zimmermann | 6 | 6 | | SE | K Zimmermann | 6 | 2 | 6 | | | | | | | |
| | M Di Giuseppe | 4 | 3 | | | | | | | SE | K Zimmermann | 2 | 3 | | | |
| | T Korpatsch | 7 | 7 | | | | | | | | T Korpatsch | 6 | 6 | | | |
| WC | H Tan | 5 | 5 | | | T Korpatsch | 6 | 6 | | | | | | | | |
| Q | O Sáez Larra | 6 | 3 | 4 | Q | O Sáez Larra | 1 | 2 | | | | | | | | |
| 2 | S Sharipova | 2 | 6 | 2$^r$ | | | | | | | | | | | | |