| Singles | |
|---|---|
| 2018 İstanbul Cup | |
| Champion |  Pauline Parmentier |
| Runner-up |  Polona Hercog |
| Score | 6–4, 3–6, 6–3 |
| Draw | 32 |
| Seeds | 8 |
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. [1]
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)| Semifinals | Final | ||||||||||||
| Pauline Parmentier | 6 | 6 | |||||||||||
| 7 | Irina-Camelia Begu | 3 | 4 | ||||||||||
| Pauline Parmentier | 6 | 3 | 6 | ||||||||||
| Polona Hercog | 4 | 6 | 3 | ||||||||||
 Maria Sakkari | 4 | 2 | |||||||||||
| Polona Hercog | 6 | 6 | |||||||||||
| First round | Second round | Quarterfinals | 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 | 0r | ||||||||||||||||||||
| 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 | 0r | 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 | 61 | 1 | |||||||||||||||||||||
 M Barthel | 64 | 6 | 3 | 7 | I-C Begu | 3 | 77 | 6 | |||||||||||||||||||
 C McHale | 77 | 4 | 6 | C McHale | 4 | 4 | |||||||||||||||||||||
| Q | D Jakupović | 5 | 0 | 7 | I-C Begu | 6 | 6 | ||||||||||||||||||||
| 7 | I-C Begu | 7 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | 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 | 78 | |||||||||||||||||||||
| Q |  D Kovinić | 6 | 6 | Q |  A Rus | 3 | 66 | ||||||||||||||||||||
| 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 | 1r | ||||||||||||||||||||
| 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 | ||||||||||||||||||||||||
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)| First round | Qualifying competition | ||||||||||||
| 1 | Richèl Hogenkamp | 6 | 78 | ||||||||||
| WC | Melis Sezer | 4 | 66 | ||||||||||
| 1 | Richèl Hogenkamp | 1 | 2 | ||||||||||
| 10 | Viktoriya Tomova | 6 | 6 | ||||||||||
| WC | Sara Tomic | 2 | 2 | ||||||||||
| 10 | Viktoriya Tomova | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Evgeniya Rodina | 2 | 2 | ||||||||||
 Harriet Dart | 6 | 6 | |||||||||||
| Harriet Dart | 0 | 0 | |||||||||||
| Valentyna Ivakhnenko | 6 | 6 | |||||||||||
| Valentyna Ivakhnenko | 6 | 77 | |||||||||||
| 9 | Tereza Martincová | 3 | 65 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Danka Kovinić | 6 | 6 | ||||||||||
| WC | Kimberly Birrell | 4 | 3 | ||||||||||
| 3 | Danka Kovinić | 6 | 3 | 6 | |||||||||
| Bibiane Schoofs | 3 | 6 | 3 | ||||||||||
| Bibiane Schoofs | 6 | 4 | 6 | ||||||||||
| 12 | Alexandra Dulgheru | 4 | 6 | 3 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Arantxa Rus | 7 | 6 | ||||||||||
| Irina Khromacheva | 5 | 0 | |||||||||||
| 4 | Arantxa Rus | 6 | 6 | ||||||||||
| Elitsa Kostova | 2 | 0 | |||||||||||
| Elitsa Kostova | 6 | 6 | |||||||||||
| 11 | Misaki Doi | 4 | 2 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 5 | Dalila Jakupović | 6 | 2 | 6 | |||||||||
| 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 | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 6 | Sara Sorribes Tormo | 6 | 7 | ||||||||||
| 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 | 6 | ||||||||||
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