| Doubles | |
|---|---|
| 2018 Amex-Istanbul Challenger | |
| Champions |  Rameez Junaid  Purav Raja |
| Runners-up |  Timur Khabibulin  Vladyslav Manafov |
| Final score | 7–6(7–4), 4–6, [10–7] |
Andre Begemann and Jonathan Eysseric were the defending champions but chose not to defend their title.
Rameez Junaid and Purav Raja won the title after defeating Timur Khabibulin and Vladyslav Manafov 7–6(7–4), 4–6, [10–7] in the final.
Rameez Junaid / Purav Raja (champions) Timur Khabibulin / Vladyslav Manafov (final)
Mikhail Elgin / 
Yaraslav Shyla (semifinals)
Gerard Granollers / Adrián Menéndez Maceiras (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | R Junaid P Raja | 6 | 6 | ||||||||||||||||||||||||
| PR |  A Metreveli  L Miedler | 2 | 3 | 1 | R Junaid P Raja | 6 | 6 | ||||||||||||||||||||
 T Altuna  T Fabbiano | 6 | 6 | T Altuna T Fabbiano | 1 | 1 | ||||||||||||||||||||||
| WC | U Akkoyun MN Türker | 4 | 2 | 1 | R Junaid P Raja | 6 | 4 | [10] | |||||||||||||||||||
| 3 | M Elgin Y Shyla | 6 | 6 | 3 | M Elgin Y Shyla | 2 | 6 | [7] | |||||||||||||||||||
 Q Halys A Nedovyesov | 4 | 3 | 3 | M Elgin Y Shyla | 6 | 6 | |||||||||||||||||||||
| WC | C İlkel A Yüksel | 6 | 6 | WC | C İlkel A Yüksel | 2 | 1 | ||||||||||||||||||||
| PR | A Çelikbilek  T van Rijthoven | 4 | 3 | 1 | R Junaid P Raja | 77 | 4 | [10] | |||||||||||||||||||
M Janvier  G Oliveira | 4 | 6 | [10] | 2 | T Khabibulin V Manafov | 64 | 6 | [7] | |||||||||||||||||||
| WC | S Ağabigün E Kırkın | 6 | 3 | [3] | M Janvier G Oliveira | 55 | 7 | [10] | |||||||||||||||||||
| E Benchetrit C Moutet | 77 | 6 | E Benchetrit C Moutet | 77 | 5 | [12] | |||||||||||||||||||||
| 4 | G Granollers A Menéndez Maceiras | 64 | 2 | E Benchetrit C Moutet | 1 | 66 | |||||||||||||||||||||
| B Bonzi A Hoang | 6 | 67 | [12] | 2 | T Khabibulin V Manafov | 6 | 78 | ||||||||||||||||||||
N Kuhn  D Masur | 2 | 79 | [10] | B Bonzi A Hoang | 4 | 6 | [3] | ||||||||||||||||||||
| Alt | S Betov D Yevseyev | 61 | 6 | [8] | 2 | T Khabibulin V Manafov | 6 | 4 | [10] | ||||||||||||||||||
| 2 | T Khabibulin V Manafov | 77 | 2 | [10] | |||||||||||||||||||||||
Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions, but they lost against Pierre-Ludovic Duclos and Yang Tsung-hua in the semifinals.
Rameez Junaid and Alexander Peya won in the final 6–4, 7–5 against Duclos and Yang.
Rameez Junaid and Frank Moser were the defending champions, but decided not to participate.
Rameez Junaid and Frank Moser were the defending champions but Moser decided not to participate.
Junaid played alongside Purav Raja and reached the final but lost to Arnau Brugués-Davi and João Sousa 7–5, 6–7(4–7), [11–9].
Colin Ebelthite and Adam Feeney were the defending champions but decided not to participate.
Antal van der Duim and Boy Westerhof won the title, defeating Rameez Junaid and Simon Stadler 6–4, 5–7, [10–7] in the final.
Yaraslav Shyla and Andrei Vasilevski were the defending champions but only Shyla chose to defend his title, partnering Vladyslav Manafov. Shyla lost in the quarterfinals to Evgeny Karlovskiy and Evgeny Tyurnev.
Denys Molchanov and Sergiy Stakhovsky were the defending champions but chose not to defend their title.
Laurynas Grigelis and Zdeněk Kolář were the defending champions but chose not to defend their title.
Timur Khabibulin and Aleksandr Nedovyesov were the defending champions but lost in the quarterfinals to Nikola Čačić and Nino Serdarušić.
Sriram Balaji and Vishnu Vardhan were the defending champions but chose not to defend their title.
Kevin Krawietz and Andreas Mies were the defending champions but lost in the quarterfinals to David Pérez Sanz and Mark Vervoort.
The 2018 Amex-Istanbul Challenger was a professional tennis tournament played on hard courts. It was the 31st edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Istanbul, Turkey between 10 and 16 September 2018.
Attila Balázs and Fabiano de Paula were the defending champions and chose not to defend their title.
Marco Cecchinato and Matteo Donati were the defending champions but chose not to defend their title.
Kevin Krawietz and Andreas Mies were the defending champions but chose not to defend their title.
Marin and Tomislav Draganja were the defending champions but only Tomislav chose to defend his title, partnering Nikola Čačić. Tomislav Draganja lost in the quarterfinals to Rameez Junaid and David Pel.
Lorenzo Giustino and Gonçalo Oliveira were the defending champions but only Oliveira chose to defend his title, partnering Andrei Vasilevski. Oliveira lost in the final to Jurij Rodionov and Emil Ruusuvuori.
Sriram Balaji and Vishnu Vardhan were the defending champions but chose not to defend their title.
Mikhail Elgin and Yaraslav Shyla were the defending champions but chose not to defend their title.
Rameez Junaid and Purav Raja were the defending champions but lost in the quarterfinals to Andrey Golubev and Aleksandr Nedovyesov.
Purav Raja and Antonio Šančić were the defending champions but only Raja chose to defend his title, partnering Rameez Junaid. Raja lost in the first round to Scott Clayton and Evan Hoyt.