# 2015 AON Open Challenger – Singles

Albert Ramos-Viñolas was the defending champion.

## Seeds

* Albert Ramos-Viñolas (semifinals)
* Robin Haase (semifinals)
* Paolo Lorenzi (second round)
* Nikoloz Basilashvili (first round)
* Marco Cecchinato (final)
* Dušan Lajović (first round)
* Nicolás Almagro (champion)
* Kenny de Schepper (first 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

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Albert Ramos | 6 | 1 | 4 | | | | | |
| 5 | Marco Cecchinato | 0 | 6 | 6 | | | | | |
| 5 | Marco Cecchinato | 0 | 6 | 6 | 5 | Marco Cecchinato | 7$^7$ | 1 | 4 |
| | | | | | 7 | Nicolás Almagro | 6$^1$ | 6 | 6 |
| 7 | Nicolás Almagro | 3 | 6 | 6 | 7 | Nicolás Almagro | 6$^1$ | 6 | 6 |
| 2 | Robin Haase | 6 | 1 | 4 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | A Ramos-Viñolas | 6 | 6 | | | | | | | | | | | | | | |
| | M Fucsovics | 2 | 0 | | 1 | A Ramos-Viñolas | 6 | 6 | | | | | | | | | |
| | L Djere | 3 | 4 | | | H Zeballos | 2 | 2 | | | | | | | | | |
| | H Zeballos | 6 | 6 | | | | | | 1 | A Ramos-Viñolas | 6 | 6 | | | | | |
| Q | A Šančić | 2 | 3 | | | | | | | S Caruso | 4 | 4 | | | | | |
| Q | A Smirnov | 6 | 6 | | Q | A Smirnov | 4 | 5 | | | | | | | | | |
| | S Caruso | 6 | 2 | 6 | | S Caruso | 6 | 7 | | | | | | | | | |
| 8 | K de Schepper | 3 | 6 | 1 | | | | | | | | | 1 | A Ramos-Viñolas | 6 | 1 | 4 |
| 3 | P Lorenzi | 6 | 6 | | | | | | | | | | 5 | M Cecchinato | 0 | 6 | 6 |
| | M Delić | 2 | 4 | | 3 | P Lorenzi | 2 | 5 | | | | | | | | | |
| | A Arnaboldi | 2 | 6 | 3 | | F Volandri | 6 | 7 | | | | | | | | | |
| | F Volandri | 6 | 1 | 6 | | | | | | F Volandri | 3 | 1$^r$ | | | | | |
| Q | JC Sáez | 4 | 2 | | | | | | 5 | M Cecchinato | 6 | 2 | | | | | |
| | A Šetkić | 6 | 6 | | | A Šetkić | 1 | 6$^1$ | | | | | | | | | |
| | A Giannessi | 3 | 7 | 6$^5$ | 5 | M Cecchinato | 6 | 7$^7$ | | | | | | | | | |
| 5 | M Cecchinato | 6 | 5 | 7$^7$ | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | N Almagro | 6 | 6 | | | | | | | | | | | | | | |
| | J Šátral | 4 | 4 | | 7 | N Almagro | 6 | 7 | | | | | | | | | |
| WC | Edoardo Eremin | 6$^4$ | 6 | 7 | WC | E Eremin | 4 | 5 | | | | | | | | | |
| WC | L Giustino | 7$^7$ | 3 | 5 | | | | | 7 | N Almagro | 6 | 6 | | | | | |
| | A Pavlásek | 7 | 6 | | | | | | | T Brkić | 2 | 2 | | | | | |
| WC | A Basso | 5 | 2 | | | A Pavlásek | 3 | 1 | | | | | | | | | |
| | T Brkić | 6 | 4 | 6 | | T Brkić | 6 | 6 | | | | | | | | | |
| 4 | N Basilashvili | 2 | 6 | 4 | | | | | | | | | 7 | N Almagro | 3 | 6 | 6 |
| 6 | D Lajović | 6 | 4 | 5 | | | | | | | | | 2 | R Haase | 6 | 1 | 4 |
| | Y Marti | 3 | 6 | 7 | | Y Marti | 3 | 4 | | | | | | | | | |
| | A Golubev | 7$^7$ | 7$^9$ | | | A Golubev | 6 | 6 | | | | | | | | | |
| WC | G Mager | 6$^4$ | 6$^7$ | | | | | | | A Golubev | 3 | 6$^{10}$ | | | | | |
| | B Balleret | 4 | 3 | | | | | | 2 | R Haase | 6 | 7$^{12}$ | | | | | |
| Q | S Doumbia | 6 | 6 | | Q | S Doumbia | 6$^1$ | 3 | | | | | | | | | |
| | M Donati | 2 | 2 | | 2 | R Haase | 7$^7$ | 6 | | | | | | | | | |
| 2 | R Haase | 6 | 6 | | | | | | | | | | | | | | |