Istanbul Open

From 2015 to 2018, it was part of the ATP 250 Series. The tournament was played on outdoor clay courts. This was the first Turkish ATP World Tour event.

The inaugural tournament was held from 27 April to 3 May 2015 at the "Koza World of Sports" facility, which is promoted as the largest tennis academy in the world. The center court featured a retractable roof and provided seating for 7,500 people. Two other clay show courts raised available seating to 9,500. The tournament was discontinued in 2018.

Singles

Year	Champions	Runners-up	Score
2015	Roger Federer	Pablo Cuevas	6–3, 7–6(13–11)
2016	Diego Schwartzman	Grigor Dimitrov	6–7(5–7), 7–6(7–4), 6–0
2017	Marin Čilić	Milos Raonic	7–6(7–3), 6–3
2018	Taro Daniel	Malek Jaziri	7–6(7–4), 6–4

Doubles

Year	Champions	Runners-up	Score
2015	Radu Albot   Dušan Lajović	Robert Lindstedt   Jürgen Melzer	6–4, 7–6(7–2)
2016	Flavio Cipolla   Dudi Sela	Andrés Molteni   Diego Schwartzman	6–3, 5–7, [10–7]
2017	Roman Jebavý   Jiří Veselý	Tuna Altuna   Alessandro Motti	6–0, 6–0
2018	Dominic Inglot   Robert Lindstedt	Ben McLachlan   Nicholas Monroe	3–6, 6–3, [10–8]

• İstanbul Cup – women's tournament