2018 Istanbul Open should not be confused with 2018 İstanbul Cup.
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.[1] 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.[2]
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Marin Čilić | 4 | 1 | ||
 Bosnia and Herzegovina | Damir Džumhur | 32 | 2 | |
 Italy | Andreas Seppi | 55 | 3 | |
| Aljaž Bedene | 57 | 4 | ||
| Italy | Paolo Lorenzi | 66 | 5 | |
 Serbia | Viktor Troicki | 71 | 6 | |
 Czech Republic | Jiří Veselý | 78 | 7 | |
 Georgia | Nikoloz Basilashvili | 79 | 8 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
Taro Daniel Dušan Lajović
Alexandr Dolgopolov → replaced by 
Mikhail Youzhny Filip Krajinović → replaced by 
Malek Jaziri
Horacio Zeballos → replaced by 
John Millman| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Japan | Ben McLachlan | Nicholas Monroe | 81 | 1 | ||
 Poland | Marcin Matkowski |  India | Divij Sharan | 88 | 2 | |
| Hans Podlipnik Castillo |  Belarus | Andrei Vasilevski | 104 | 3 | ||
 United Kingdom | Ken Skupski | United Kingdom | Neal Skupski | 110 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: 2018 Istanbul Open – Singles.
Taro Daniel def. Malek Jaziri, 7–6(7–4), 6–4See main article: 2018 Istanbul Open – Doubles.
Dominic Inglot / 
Robert Lindstedt def. Ben McLachlan / 
Nicholas Monroe, 3–6, 6–3, [10–8]
