2018 İstanbul Cup

The 2018 İstanbul Cup (also known as the TEB BNP Paribas İstanbul Cup for sponsorship reasons) was a tennis tournament played on outdoor clay courts. It was the 11th edition of the İstanbul Cup, and part of the WTA International tournaments of the 2018 WTA Tour. It took place in Istanbul, Turkey, from 23 through 29 April 2018.

Seeds

 * Rankings are as of April 16, 2018.

Other entrants
The following players received wildcard s into the singles main draw:
 * 🇹🇷 Ayla Aksu
 * 🇹🇷 Çağla Büyükakçay
 * 🇹🇷 İpek Öz

The following players received entry from the qualifying draw:
 * 🇷🇺 Valentyna Ivakhnenko
 * Dalila Jakupović
 * 🇷🇺 Anna Kalinskaya
 * 🇲🇪 Danka Kovinić
 * Arantxa Rus
 * 🇧🇬 Viktoriya Tomova

Withdrawals

 * 🇧🇷 Beatriz Haddad Maia → replaced by 🇺🇸 Christina McHale
 * 🇺🇦 Kateryna Kozlova → replaced by 🇦🇺 Ajla Tomljanović
 * 🇩🇪 Tatjana Maria → replaced by 🇮🇹 Sara Errani
 * 🇯🇵 Naomi Osaka → replaced by Polona Hercog

Retirements

 * 🇺🇦 Kateryna Bondarenko
 * 🇵🇱 Agnieszka Radwańska
 * Caroline Wozniacki

Seeds

 * 1 Rankings as of April 16, 2018.

Other entrants
The following pairs received wildcard s into the doubles main draw:
 * 🇹🇷 Ayla Aksu / 🇬🇧 Harriet Dart
 * 🇹🇷 İpek Öz / 🇹🇷 Melis Sezer

Withdrawals

 * During the tournament
 * 🇺🇦 Kateryna Bondarenko

Singles

 * 🇫🇷 Pauline Parmentier def. Polona Hercog, 6–4, 3–6, 6–3

Doubles

 * 🇨🇳 Liang Chen / 🇨🇳 Zhang Shuai def. Xenia Knoll / 🇬🇧 Anna Smith, 6–4, 6–4