2018 Istanbul Open

The 2018 Istanbul Open (also known as the TEB BNP Paribas Istanbul Open for sponsorship purposes) 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.

Seeds

 * Rankings are as of April 23, 2018.

Other entrants
The following players received wildcards into the main draw:
 * 🇹🇷 Marsel İlhan
 * 🇹🇷 Cem İlkel
 * 🇦🇺 Bernard Tomic

The following players received entry from the qualifying draw:
 * 🇪🇸 Daniel Gimeno Traver
 * 🇧🇷 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

Seeds

 * Rankings are as of April 23, 2018.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * 🇹🇷 Tuna Altuna / 🇹🇷 Anıl Yüksel
 * 🇹🇷 Cem İlkel / 🇦🇺 Bernard Tomic

Withdrawals

 * During the tournament
 * 🇷🇸 Viktor Troicki

Singles

 * 🇯🇵 Taro Daniel def. 🇹🇳 Malek Jaziri, 7–6(7–4), 6–4

Doubles

 * 🇬🇧 Dominic Inglot / 🇸🇪 Robert Lindstedt def. 🇯🇵 Ben McLachlan / 🇺🇸 Nicholas Monroe, 3–6, 6–3, [10–8]