2020 İstanbul Cup
The 2020 İstanbul Cup was a women's tennis tournament played on outdoor clay courts. It was the 13th edition of the İstanbul Cup, and part of the WTA International tournaments category of the 2020 WTA Tour. It took place in Istanbul, Turkey, from 8 September through 13 September 2020. Unseeded Patricia Maria Țig won the singles title.
Finals
Singles
Patricia Maria Țig defeated Eugenie Bouchard 2–6, 6–1, 7–6- It was Țig's only singles title of the year and the 1st of her career.
Doubles
- Alexa Guarachi / Desirae Krawczyk defeated Ellen Perez / Storm Sanders, 6–1, 6–3
Singles main-draw entrants
Seeds
Other entrants
The following players received wildcardThe following players received entry using a protected ranking into the singles main draw:
The following players received entry from the qualifying draw:
Withdrawals
;Before the tournament- Marie Bouzková → replaced by Kateryna Bondarenko
- Sorana Cîrstea → replaced by Greet Minnen
- Hsieh Su-wei → replaced by Patricia Maria Țig
- Veronika Kudermetova → replaced by Margarita Gasparyan
- Magda Linette → replaced by Aliaksandra Sasnovich
- Elise Mertens → replaced by Katarina Zavatska
- Kristina Mladenovic → replaced by Jasmine Paolini
- Jeļena Ostapenko → replaced by Viktória Kužmová
- Yulia Putintseva → replaced by Stefanie Vögele
- Anastasija Sevastova → replaced by Kaja Juvan
- Laura Siegemund → replaced by Viktoriya Tomova
- Ajla Tomljanović → replaced by Danka Kovinić
- Tamara Zidanšek → replaced by Anna Karolína Schmiedlová
Doubles main-draw entrants
Seeds
1 Rankings as of August 31, 2020.Other entrants
The following pairs received wildcardThe following pair received entry as alternates: