# 2011 AON Open Challenger – Singles

Fabio Fognini was the defending champion but decided not to participate. Martin Kližan won the title after defeating Leonardo Mayer 6–3, 6–1 in the final.

## Seeds

* Pablo Andújar (first round)
* Carlos Berlocq (withdrew)
* Rui Machado (quarterfinals)
* Filippo Volandri (second round, retired due to low back pain)
* Andrey Golubev (first round)
* Martin Kližan (champion)
* Diego Junqueira (first round)
* Frederico Gil (semifinals)
* Horacio Zeballos (semifinals)

## 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 |
| 8 | Frederico Gil | 7$^7$ | 4 | 3 | | | | |
| 6 | Martin Kližan | 6$^3$ | 6 | 6 | | | | |
| 6 | Martin Kližan | 6$^3$ | 6 | 6 | 6 | Martin Kližan | 6 | 6 |
| | | | | | | Leonardo Mayer | 3 | 1 |
| | Leonardo Mayer | 7 | 5 | | | Leonardo Mayer | 3 | 1 |
| 9 | Horacio Zeballos | 5 | 1 | | | | | |

### 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/WC | P Andújar | 5 | 6 | 6$^2$ | | | | | | | | | | | | | |
| | A di Mauro | 7 | 3 | 7$^7$ | | A di Mauro | 4 | 4 | | | | | | | | | |
| | A Giannessi | 6 | 6 | | | A Giannessi | 6 | 6 | | | | | | | | | |
| Q | B Balleret | 1 | 2 | | | | | | | A Giannessi | 5 | 1 | | | | | |
| | K Mesaroš | 6 | 6 | | | | | | 8 | F Gil | 7 | 6 | | | | | |
| | S Galvani | 1 | 4 | | | K Mesaroš | 1 | 4 | | | | | | | | | |
| WC | Edoardo Eremin | 4 | 3 | | 8 | F Gil | 6 | 6 | | | | | | | | | |
| 8 | F Gil | 6 | 6 | | | | | | | | | | 8 | F Gil | 7$^7$ | 4 | 3 |
| 4 | F Volandri | 1 | 6 | 6 | | | | | | | | | 6 | M Kližan | 6$^3$ | 6 | 6 |
| WC | Andea Basso | 6 | 3 | 1 | 4 | F Volandri | 0 | 1$^r$ | | | | | | | | | |
| | G Naso | 0 | 6 | 6 | | G Naso | 6 | 4 | | | | | | | | | |
| | W Trusendi | 6 | 3 | 3 | | | | | | G Naso | 6$^1$ | 3 | | | | | |
| | F Nielsen | 6 | 6 | | | | | | 6 | M Kližan | 7$^7$ | 6 | | | | | |
| | I Bozoljac | 1 | 2 | | | F Nielsen | 2 | 4 | | | | | | | | | |
| Q | Michael Linzer | 1 | 2 | | 6 | M Kližan | 6 | 6 | | | | | | | | | |
| 6 | M Kližan | 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 |
| 5 | A Golubev | 6 | 4 | 4 | | | | | | | | | | | | | |
| | M Zverev | 4 | 6 | 6 | | M Zverev | 4 | 0 | | | | | | | | | |
| | L Mayer | 6 | 7$^7$ | | | L Mayer | 6 | 6 | | | | | | | | | |
| | D Brown | 3 | 6$^5$ | | | | | | | | L Mayer | 6 | 7$^7$ | | | | |
| WC | Francesco Picco | 2 | 4 | | | | | | | 3 | R Machado | 3 | 6$^1$ | | | | |
| Alt | D Giorgini | 6 | 6 | | Alt | D Giorgini | 6 | 3 | 4 | | | | | | | | |
| LL | R Olivo | 1 | 2 | | 3 | R Machado | 3 | 6 | 6 | | | | | | | | |
| 3 | R Machado | 6 | 6 | | | | | | | | | | | | L Mayer | 7 | 6 |
| 7 | D Junqueira | 6 | 3 | 5 | | | | | | | | | | 9 | H Zeballos | 5 | 1 |
| Q | T Fabbiano | 2 | 6 | 7 | Q | T Fabbiano | 5 | 6 | 6 | | | | | | | | |
| | M Crugnola | 6 | 6 | | | M Crugnola | 7 | 1 | 4 | | | | | | | | |
| Q | Guillermo Durán | 2 | 3 | | | | | | | Q | T Fabbiano | 3 | 1 | | | | |
| | T Nieminen | 4 | 1 | | | | | | | 9 | H Zeballos | 6 | 6 | | | | |
| LL | Enrico Burzi | 6 | 6 | | LL | E Burzi | 4 | 2 | | | | | | | | | |
| Alt | B Pašanski | 3 | 7$^7$ | 6$^6$ | 9 | H Zeballos | 6 | 6 | | | | | | | | | |
| 9 | H Zeballos | 6 | 6$^4$ | 7$^8$ | | | | | | | | | | | | | |