2018 Istanbul Open
The 2018 Istanbul Open was a men's tennis tournament played on outdoor clay courts. It was the fourth edition of the Istanbul Open, and an ATP [World Tour 250] event. It took place at the Koza World of Sports Arena in Istanbul, Turkey, from 30 April-6 May 2018.
Singles main-draw entrants
Seeds
- Rankings are as of April 23, 2018.
Other entrants
The following players received wildcards into the main draw:The following players received entry from the qualifying draw:
- Daniel [Gimeno Traver]
- Thiago [Monteiro (tennis)|Thiago Monteiro]
- Marco Trungelliti
- Elias Ymer
Withdrawals
;Before the tournament- Borna Ćorić → replaced by Taro Daniel
- Pablo Cuevas → replaced by Dušan Lajović
- Alexandr Dolgopolov → replaced by Mikhail Youzhny
- Filip Krajinović → replaced by Malek Jaziri
- Horacio Zeballos → replaced by John Millman
Doubles main-draw entrants
Seeds
- Rankings are as of April 23, 2018.