# 2019 Amex-Istanbul Challenger – Singles

Corentin Moutet was the defending champion but chose not to defend his title.
Ugo Humbert won the title after defeating Denis Istomin 6–2, 6–2 in the final.

## Seeds

All seeds receive a bye into the second round.
* Ugo Humbert (champion)
* Marcel Granollers (withdrew)
* Marius Copil (third round)
* Malek Jaziri (withdrew)
* Denis Istomin (final)
* Lukáš Rosol (third round)
* Maxime Janvier (second round)
* Ramkumar Ramanathan (third round)
* Roberto Marcora (third round)
* Ruben Bemelmans (quarterfinals)
* Jay Clarke (second round)
* Nicola Kuhn (quarterfinals)
* Aleksandr Nedovyesov (quarterfinals)
* Roman Safiullin (second round)
* Santiago Giraldo (withdrew)
* Blaž Kavčič (semifinals)
* Matteo Viola (third round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Ugo Humbert | 6$^3$ | 7 | 6 | | | | | | | | | |
| 10 | Ruben Bemelmans | 7$^7$ | 5 | 2 | | | | | | | | | |
| 10 | Ruben Bemelmans | 7$^7$ | 5 | 2 | 1 | Ugo Humbert | 6 | 6 | | | | | |
| | | | | | 16 | Blaž Kavčič | 2 | 1 | | | | | |
| 16 | Blaž Kavčič | 6 | 6 | | 16 | Blaž Kavčič | 2 | 1 | | | | | |
| 12 | Nicola Kuhn | 3 | 0 | | | | | | | | | | |
| 12 | Nicola Kuhn | 3 | 0 | | | | | | | 1 | Ugo Humbert | 6 | 6 |
| | | | | | | | | | | 5 | Denis Istomin | 2 | 2 |
| | Botic van de Zandschulp | 6 | 6 | | | | | | | | | | | 5 | Denis Istomin | 2 | 2 |
| | David Poljak | 3 | 2 | | | | | | | | | | |
| | David Poljak | 3 | 2 | | | Botic van de Zandschulp | 3 | 6 | 3 | | | | |
| | | | | | 5 | Denis Istomin | 6 | 3 | 6 | | | | |
| 5 | Denis Istomin | 6 | 6 | | 5 | Denis Istomin | 6 | 3 | 6 | | | | |
| 13 | Aleksandr Nedovyesov | 3 | 4 | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | U Humbert | 6 | 6 | | | | | | | | | | |
| Alt | M Gengel | 6 | 6 | | Alt | M Gengel | 1 | 2 | | | | | | | | | | |
| | S Danilov | 2 | 0 | | | | | | | 1 | U Humbert | 6 | 6 | | | | | |
| | H Grenier | 6 | 5 | 6 | | | | | | | H Grenier | 2 | 4 | | | | | |
| | J Rodionov | 3 | 7 | 2 | | H Grenier | 6 | 6 | | | | | | | | | | |
| | | | | | Alt | S Arends | 2 | 3 | | | | | | | | | | |
| | | | | | | | | | | | | | | 1 | U Humbert | 6$^3$ | 7 | 6 |
| | | | | | | | | | | | | | | 10 | R Bemelmans | 7$^7$ | 5 | 2 |
| | | | | | 10 | R Bemelmans | 6 | 7 | | | | | | | | | | |
| | A Jecan | 6 | 6 | | | A Jecan | 2 | 5 | | | | | | | | | | |
| | Shalva Dzhanashiya | 2 | 0 | | | | | | | 10 | R Bemelmans | 6 | 6 | | | | | |
| | D Yevseyev | 6$^4$ | 2 | | | | | | | 6 | L Rosol | 4 | 3 | | | | | |
| | G Blancaneaux | 7$^7$ | 6 | | | G Blancaneaux | 2 | 6 | 4 | | | | | | | | | |
| | | | | | 6 | L Rosol | 6 | 3 | 6 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 3 | M Copil | 6 | 0 | 6 | | | | | | | | |
| | A Lazov | 5 | 6 | 1 | | R Roumane | 3 | 6 | 2 | | | | | | | | |
| | R Roumane | 7 | 2 | 6 | | | | | | 3 | M Copil | 3 | 5 | | | | |
| Alt | Burak Can Yılmaz | 2 | 1 | | | | | | | 16 | B Kavčič | 6 | 7 | | | | |
| | FC Jianu | 6 | 6 | | | FC Jianu | 7$^{10}$ | 3 | 1$^r$ | | | | | | | | |
| | | | | | 16 | B Kavčič | 6$^8$ | 6 | 2 | | | | | | | | |
| | | | | | | | | | | | | | | 16 | B Kavčič | 6 | 6 |
| | | | | | | | | | | | | | | 12 | N Kuhn | 3 | 0 |
| | | | | | 12 | N Kuhn | 6 | 6 | | | | | | | | | |
| WC | Kirill Saplin | 0 | 1 | | Alt | VV Cornea | 2 | 4 | | | | | | | | | |
| Alt | VV Cornea | 6 | 6 | | | | | | | 12 | N Kuhn | 6 | 7 | | | | |
| WC | M İlhan | 6 | 6 | | | | | | | 8 | R Ramanathan | 3 | 5 | | | | |
| WC | MN Türker | 4 | 3 | | WC | M İlhan | 2 | 2 | | | | | | | | | |
| | | | | | 8 | R Ramanathan | 6 | 6 | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 7 | M Janvier | 6 | 4 | 2 | | | | | | | | |
| | A Dubrivnyy | 3 | 2 | | B van de Zandschulp | 1 | 6 | 6 | | | | | | | | |
| | B van de Zandschulp | 6 | 6 | | | | | | | B van de Zandschulp | 1 | 6 | 6 | | | |
| | L Miedler | 6 | 6 | | | | | | | L Miedler | 6 | 1 | 3 | | | |
| | A Müller | 4 | 4 | | L Miedler | 6 | 7 | | | | | | | | | |
| | | | | 11 | J Clarke | 3 | 5 | | | | | | | | | |
| | | | | | | | | | | | | | | B van de Zandschulp | 6 | 6 |
| | | | | | | | | | | | | | | D Poljak | 3 | 2 |
| | | | | 14 | R Safiullin | 4 | 6 | 2 | | | | | | | | |
| | A Golubev | 4 | 5 | | D Poljak | 6 | 3 | 6 | | | | | | | | |
| | David Poljak | 6 | 7 | | | | | | | D Poljak | 6$^4$ | 6 | 6 | | | |
| WC | HVN Rune | 1 | 3 | | | | | | 17 | M Viola | 7$^7$ | 4 | 4 | | | |
| | T Lamasine | 6 | 6 | | T Lamasine | 4 | 1 | | | | | | | | | |
| | | | | 17 | M Viola | 6 | 6 | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | D Istomin | 6$^9$ | 6 | 2 | | | | | | | | | |
| | M Neuchrist | 2$^r$ | | | | M Zverev | 7$^{11}$ | 2 | 1$^r$ | | | | | | | | | |
| | M Zverev | 5 | | | | | | | | 5 | D Istomin | 3 | 6 | 7$^{11}$ | | | | |
| | E Karlovskiy | 3 | 6$^5$ | | | | | | | 9 | R Marcora | 6 | 3 | 6$^9$ | | | | |
| | A Šetkić | 6 | 7$^7$ | | | A Šetkić | 1 | 1 | | | | | | | | | | |
| | | | | | 9 | R Marcora | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 5 | D Istomin | 6 | 6 |
| | | | | | | | | | | | | | | | 13 | A Nedovyesov | 3 | 4 |
| | | | | | 13 | A Nedovyesov | 6 | 6 | | | | | | | | | | |
| WC | Baran Cengiz | 6 | 6 | | WC | B Cengiz | 1 | 4 | | | | | | | | | | |
| | S Carr | 3 | 2 | | | | | | | 13 | A Nedovyesov | 6 | 3 | | | | | |
| | Y Mertens | 5 | 6 | 6$^3$ | | | | | | | E Hoyt | 2 | 0$^r$ | | | | | |
| | E Hoyt | 7 | 4 | 7$^7$ | | E Hoyt | 6 | 7 | | | | | | | | | | |
| | | | | | Alt | M Elgin | 4 | 5 | | | | | | | | | | |