# 2017 AON Open Challenger – Singles

Jerzy Janowicz was the defending champion but chose not to defend his title.
Stefanos Tsitsipas won the title after defeating Guillermo García López 7–5, 7–6$^{(7–2)}$ in the final.

## Seeds

* Jan-Lennard Struff (quarterfinals)
* Andreas Seppi (first round)
* Alessandro Giannessi (second round)
* Laslo Đere (second round)
* Marco Cecchinato (first round)
* Renzo Olivo (first round)
* Dustin Brown (second round)
* Márton Fucsovics (semifinals, retired)

## 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

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| WC | Stefanos Tsitsipas | 6 | 1 | | | | | |
| 8 | Márton Fucsovics | 0 | 0$^r$ | | | | | |
| 8 | Márton Fucsovics | 0 | 0$^r$ | | WC | Stefanos Tsitsipas | 7 | 7$^7$ |
| | | | | | | Guillermo García López | 5 | 6$^2$ |
| | Guillermo García López | 6 | 6$^5$ | 6 | | Guillermo García López | 5 | 6$^2$ |
| | Stefano Napolitano | 2 | 7$^7$ | 3 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | J-L Struff | 6 | 7$^7$ | | | | | | | | | | | | | | |
| | M Zekić | 4 | 6$^2$ | | 1 | J-L Struff | 7$^8$ | 7$^7$ | | | | | | | | | |
| Alt | H Hurkacz | 6 | 2 | 5 | | U Ignatik | 6$^6$ | 6$^4$ | | | | | | | | | |
| | U Ignatik | 3 | 6 | 7 | | | | | 1 | J-L Struff | 2 | 3 | | | | | |
| | G Andreozzi | 3 | 4 | | | | | | WC | S Tsitsipas | 6 | 6 | | | | | |
| WC | S Tsitsipas | 6 | 6 | | WC | S Tsitsipas | 6 | 6 | | | | | | | | | |
| | A Šetkić | 1 | 7$^7$ | 6 | | A Šetkić | 2 | 4 | | | | | | | | | |
| 5 | M Cecchinato | 6 | 6$^5$ | 3 | | | | | | | | | | WC | S Tsitsipas | 6 | 1 |
| 4 | L Đere | 6 | 5 | 6 | | | | | | | | | | 8 | M Fucsovics | 0 | 0$^r$ |
| Q | Gianluca Di Nicola | 1 | 7 | 4 | 4 | L Đere | 3 | 3 | | | | | | | | | |
| | E Ymer | 3 | 6$^4$ | | | A Balázs | 6 | 6 | | | | | | | | | |
| | A Balázs | 6 | 7$^7$ | | | | | | | A Balázs | 7$^7$ | 2 | 5 | | | | |
| Q | T Pütz | 7$^7$ | 6 | | | | | | 8 | M Fucsovics | 6$^4$ | 6 | 7 | | | | |
| Alt | F Gaio | 6$^0$ | 1 | | Q | T Pütz | 1 | 2 | | | | | | | | | |
| | S Caruso | 1 | 1 | | 8 | M Fucsovics | 6 | 6 | | | | | | | | | |
| 8 | M Fucsovics | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | R Olivo | 5 | 2 | | | | | | | | | | | | | | |
| | A Vatutin | 7 | 6 | | | A Vatutin | 6 | 4 | 1 | | | | | | | | |
| Q | A Pellegrino | 3 | 4 | | WC | M Donati | 2 | 6 | 6 | | | | | | | | |
| WC | M Donati | 6 | 6 | | | | | | | WC | M Donati | 4 | 2 | | | | |
| | J Eysseric | 4 | 1 | | | | | | | | G García López | 6 | 6 | | | | |
| | G García López | 6 | 6 | | | G García López | 6 | 7 | | | | | | | | | |
| WC | J Ocleppo | 5 | 1 | | 3 | A Giannessi | 4 | 5 | | | | | | | | | |
| 3 | A Giannessi | 7 | 6 | | | | | | | | | | | G García López | 6 | 6$^5$ | 6 |
| 7 | D Brown | 7 | 6 | | | | | | | | | | | S Napolitano | 2 | 7$^7$ | 3 |
| Alt | R Bonadio | 5 | 2 | | 7 | D Brown | 4 | 2 | | | | | | | | | |
| | M Berrettini | 4 | 6 | 2 | | S Napolitano | 6 | 6 | | | | | | | | | |
| | S Napolitano | 6 | 3 | 6 | | | | | | | S Napolitano | 7$^7$ | 6 | | | | |
| | K de Schepper | 2 | 2 | | | | | | | Q | A Basso | 6$^2$ | 4 | | | | |
| | J Kovalík | 6 | 6 | | | J Kovalík | 6 | 3 | 4 | | | | | | | | |
| Q | A Basso | 6$^1$ | 6 | 7$^7$ | Q | A Basso | 3 | 6 | 6 | | | | | | | | |
| 2/WC | A Seppi | 7$^7$ | 3 | 6$^4$ | | | | | | | | | | | | | |