# 2018 İstanbul Cup – Singles

Elina Svitolina was the defending champion, but chose to compete in Stuttgart instead.
Pauline Parmentier won the title, her first since 2008, defeating Polona Hercog in the final, 6–4, 3–6, 6–3.

## Seeds

* Caroline Wozniacki (quarterfinals, retired)
* Svetlana Kuznetsova (quarterfinals)
* Agnieszka Radwańska (first round, retired)
* Zhang Shuai (first round)
* Ekaterina Makarova (first round)
* Sorana Cîrstea (first round)
* Irina-Camelia Begu (semifinals)
* Aryna Sabalenka (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 |
| | Pauline Parmentier | 6 | 6 | | | | |
| 7 | Irina-Camelia Begu | 3 | 4 | | | | |
| 7 | Irina-Camelia Begu | 3 | 4 | Pauline Parmentier | 6 | 3 | 6 |
| | | | | Polona Hercog | 4 | 6 | 3 |
| | Maria Sakkari | 4 | 2 | Polona Hercog | 4 | 6 | 3 |
| | Polona Hercog | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | C Wozniacki | 6 | 6 | | | | | | | | | | | | | | | |
| | E Alexandrova | 2 | 2 | | 1 | C Wozniacki | 5 | 6 | 6 | | | | | | | | | |
| | S Errani | 6 | 6 | | | S Errani | 7 | 3 | 3 | | | | | | | | | |
| | K Flipkens | 3 | 4 | | | | | | | 1 | C Wozniacki | 6 | 3 | 0$^r$ | | | | |
| WC | A Aksu | 2 | 2 | | | | | | | | P Parmentier | 4 | 6 | 0 | | | | |
| | P Parmentier | 6 | 6 | | | P Parmentier | 6 | 2 | 6 | | | | | | | | | |
| | Y Putintseva | 0 | 6 | 6 | | Y Putintseva | 2 | 6 | 3 | | | | | | | | | |
| 6 | S Cîrstea | 6 | 1 | 0 | | | | | | | | | | | | P Parmentier | 6 | 6 |
| 3 | A Radwańska | 1 | 0$^r$ | | | | | | | | | | | | 7 | I-C Begu | 3 | 4 |
| | D Vekić | 6 | 2 | | | D Vekić | 6 | 6 | | | | | | | | | | |
| | A Tomljanović | 6 | 6 | | | A Tomljanović | 1 | 2 | | | | | | | | | | |
| | A Van Uytvanck | 3 | 3 | | | | | | | | D Vekić | 6 | 6$^1$ | 1 | | | | |
| | M Barthel | 6$^4$ | 6 | 3 | | | | | | 7 | I-C Begu | 3 | 7$^7$ | 6 | | | | |
| | C McHale | 7$^7$ | 4 | 6 | | C McHale | 4 | 4 | | | | | | | | | | |
| Q | D Jakupović | 5 | 0 | | 7 | I-C Begu | 6 | 6 | | | | | | | | | | |
| 7 | I-C Begu | 7 | 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 |
| 5 | E Makarova | 6 | 1 | 4 | | | | | | | | | | | | | |
| | A Krunić | 1 | 6 | 6 | | A Krunić | 3 | 1 | | | | | | | | | |
| | M Sakkari | 7 | 6 | | | M Sakkari | 6 | 6 | | | | | | | | | |
| WC | Ç Büyükakçay | 5 | 2 | | | | | | | | M Sakkari | 6 | 7$^8$ | | | | |
| Q | D Kovinić | 6 | 6 | | | | | | | Q | A Rus | 3 | 6$^6$ | | | | |
| Q | A Kalinskaya | 3 | 3 | | Q | D Kovinić | 6 | 2 | 0 | | | | | | | | |
| Q | A Rus | 6 | 6 | | Q | A Rus | 2 | 6 | 6 | | | | | | | | |
| 4 | S Zhang | 2 | 3 | | | | | | | | | | | | M Sakkari | 4 | 2 |
| 8 | A Sabalenka | 2 | 5 | | | | | | | | | | | | P Hercog | 6 | 6 |
| | P Hercog | 6 | 7 | | | P Hercog | 6 | 1 | | | | | | | | | |
| WC | İ Öz | 6 | 4 | 0 | | K Bondarenko | 2 | 1$^r$ | | | | | | | | | |
| | K Bondarenko | 4 | 6 | 6 | | | | | | | P Hercog | 6 | 1 | 7 | | | |
| Q | V Tomova | 7 | 6 | | | | | | | 2 | S Kuznetsova | 1 | 6 | 5 | | | |
| Q | V Ivakhnenko | 5 | 4 | | Q | V Tomova | 5 | 6 | 1 | | | | | | | | |
| | Q Wang | 3 | 3 | | 2 | S Kuznetsova | 7 | 4 | 6 | | | | | | | | |
| 2 | S Kuznetsova | 6 | 6 | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Richèl Hogenkamp (qualifying competition)
* Evgeniya Rodina (first round)
* Danka Kovinić (qualified)
* Arantxa Rus (qualified)
* Dalila Jakupović (qualified)
* Sara Sorribes Tormo (qualifying competition)
* Barbora Krejčíková (qualifying competition)
* Anna Kalinskaya (qualified)
* Tereza Martincová (first round)
* Viktoriya Tomova (qualified)
* Misaki Doi (first round)
* Alexandra Dulgheru (first round)

### Qualifiers

* Viktoriya Tomova
* Valentyna Ivakhnenko
* Danka Kovinić
* Arantxa Rus
* Dalila Jakupović
* Anna Kalinskaya

#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Richèl Hogenkamp | 6 | 7$^8$ | | | | |
| WC | Melis Sezer | 4 | 6$^6$ | | | | |
| WC | Melis Sezer | 4 | 6$^6$ | 1 | Richèl Hogenkamp | 1 | 2 |
| | | | | 10 | Viktoriya Tomova | 6 | 6 |
| WC | Sara Tomic | 2 | 2 | 10 | Viktoriya Tomova | 6 | 6 |
| 10 | Viktoriya Tomova | 6 | 6 | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Evgeniya Rodina | 2 | 2 | | | |
| | Harriet Dart | 6 | 6 | | | |
| | Harriet Dart | 6 | 6 | Harriet Dart | 0 | 0 |
| | | | | Valentyna Ivakhnenko | 6 | 6 |
| | Valentyna Ivakhnenko | 6 | 7$^7$ | Valentyna Ivakhnenko | 6 | 6 |
| 9 | Tereza Martincová | 3 | 6$^5$ | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Danka Kovinić | 6 | 6 | | | | | | |
| WC | Kimberly Birrell | 4 | 3 | | | | | | |
| WC | Kimberly Birrell | 4 | 3 | | 3 | Danka Kovinić | 6 | 3 | 6 |
| | | | | | | Bibiane Schoofs | 3 | 6 | 3 |
| | Bibiane Schoofs | 6 | 4 | 6 | | Bibiane Schoofs | 3 | 6 | 3 |
| 12 | Alexandra Dulgheru | 4 | 6 | 3 | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Arantxa Rus | 7 | 6 | | | | |
| | Irina Khromacheva | 5 | 0 | | | | |
| | Irina Khromacheva | 5 | 0 | 4 | Arantxa Rus | 6 | 6 |
| | | | | | Elitsa Kostova | 2 | 0 |
| | Elitsa Kostova | 6 | 6 | | Elitsa Kostova | 2 | 0 |
| 11 | Misaki Doi | 4 | 2 | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Dalila Jakupović | 6 | 2 | 6 | | | | |
| | Elena-Gabriela Ruse | 4 | 6 | 2 | | | | |
| | Elena-Gabriela Ruse | 4 | 6 | 2 | 5 | Dalila Jakupović | 6 | 6 |
| | | | | | 7 | Barbora Krejčíková | 2 | 1 |
| PR | Réka Luca Jani | 4 | 1 | | 7 | Barbora Krejčíková | 2 | 1 |
| 7 | Barbora Krejčíková | 6 | 6 | | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Sara Sorribes Tormo | 6 | 7 | | | | | |
| | Başak Eraydın | 4 | 5 | | | | | |
| | Başak Eraydın | 4 | 5 | 6 | Sara Sorribes Tormo | 3 | 7 | 3 |
| | | | | 8 | Anna Kalinskaya | 6 | 5 | 6 |
| WC | Ena Kajević | 4 | 4 | 8 | Anna Kalinskaya | 6 | 5 | 6 |
| 8 | Anna Kalinskaya | 6 | 6 | | | | | |