# 2018 Open de Cagnes-sur-Mer – Singles

Beatriz Haddad Maia was the defending champion, but chose to compete at the 2018 Mutua Madrid Open instead.
Rebecca Peterson won the title, defeating Dayana Yastremska in the final, 6–4, 7–5.

## Seeds

* Carina Witthöft (first round)
* Pauline Parmentier (first round)
* Océane Dodin (second round)
* Andrea Petkovic (semifinals)
* Viktória Kužmová (quarterfinals)
* Arantxa Rus (first round)
* Jana Fett (first round)
* Rebecca Peterson (champion)

## 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 |
| | Ons Jabeur | 2 | 3 | | | | |
| 8 | Rebecca Peterson | 6 | 6 | | | | |
| 8 | Rebecca Peterson | 6 | 6 | 8 | Rebecca Peterson | 6 | 7 |
| | | | | Q | Dayana Yastremska | 4 | 5 |
| 4/WC | Andrea Petkovic | 2 | 1 | Q | Dayana Yastremska | 4 | 5 |
| Q | Dayana Yastremska | 6 | 6 | | | | |

### 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 | 3 | 4 | | | | | | | | | | | | | | |
| Q | B Schoofs | 6 | 6 | | Q | B Schoofs | 6 | 6 | | | | | | | | | |
| | D Kovinić | 6 | 6 | | | D Kovinić | 4 | 4 | | | | | | | | | |
| | C Zhao | 3 | 2 | | | | | | | Q | B Schoofs | 2 | 2 | | | | |
| | A Blinkova | 5 | 6 | 4 | | | | | | | O Jabeur | 6 | 6 | | | | |
| Q | A Dulgheru | 7 | 4 | 6 | Q | A Dulgheru | 1 | 2 | | | | | | | | | |
| | O Jabeur | 6 | 6 | | | O Jabeur | 6 | 6 | | | | | | | | | |
| 6 | A Rus | 0 | 3 | | | | | | | | | | | | O Jabeur | 2 | 3 |
| 3 | O Dodin | 6 | 6 | | | | | | | | | | | 8 | R Peterson | 6 | 6 |
| | M Zanevska | 3 | 3 | | 3 | O Dodin | 1 | 7 | 1 | | | | | | | | |
| Q | D Seguel | 6 | 6 | | Q | D Seguel | 6 | 5 | 6 | | | | | | | | |
| | D Jakupović | 4 | 3 | | | | | | | Q | D Seguel | 3 | 4 | | | | |
| WC | F Ferro | 6 | 3 | 4 | | | | | | 8 | R Peterson | 6 | 6 | | | | |
| | T Korpatsch | 4 | 6 | 6 | | T Korpatsch | 2 | 1 | | | | | | | | | |
| WC | A Hesse | 0 | 0 | | 8 | R Peterson | 6 | 6 | | | | | | | | | |
| 8 | R Peterson | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | V Kužmová | 6 | 6 | | | | | | | | | | | | | | |
| LL | P Hon | 3 | 2 | | 5 | V Kužmová | 7 | 6 | | | | | | | | | |
| | T Martincová | 4 | 2 | | | J Paolini | 5 | 2 | | | | | | | | | |
| | J Paolini | 6 | 6 | | | | | | 5 | V Kužmová | 6 | 2 | 1 | | | | |
| | M Fręch | 2 | 3 | | | | | | 4/WC | A Petkovic | 2 | 6 | 6 | | | | |
| | E Rodina | 6 | 6 | | | E Rodina | 0 | 3 | | | | | | | | | |
| WC | E Bouchard | | | | 4/WC | A Petkovic | 6 | 6 | | | | | | | | | |
| 4/WC | A Petkovic | w/o | | | | | | | | | | | | 4/WC | A Petkovic | 2 | 1 |
| 7 | J Fett | 2 | 6$^3$ | | | | | | | | | | | Q | D Yastremska | 6 | 6 |
| | N Gibbs | 6 | 7$^7$ | | | N Gibbs | 4 | 6$^5$ | | | | | | | | | |
| | V Golubic | 6 | 4 | 6 | | V Golubic | 6 | 7$^7$ | | | | | | | | | |
| LL | J Fourlis | 3 | 6 | 1 | | | | | | V Golubic | 5 | 6 | 4 | | | | |
| | O Rogowska | 5 | 2 | | | | | | Q | D Yastremska | 7 | 1 | 6 | | | | |
| Q | D Yastremska | 7 | 6 | | Q | D Yastremska | 6 | 6 | | | | | | | | | |
| | J Teichmann | 6 | 6$^4$ | 6 | | J Teichmann | 3 | 3 | | | | | | | | | |
| 2 | P Parmentier | 2 | 7$^7$ | 4 | | | | | | | | | | | | | |