# 2023 AON Open Challenger – Singles

Thiago Monteiro was the defending champion but lost in the semifinals to Fabio Fognini.
Thiago Seyboth Wild won the title after defeating Fognini 6–2, 7–6$^{(7–3)}$ in the final.

## Seeds

* Alexander Shevchenko (second round)
* Federico Coria (quarterfinals)
* Thiago Seyboth Wild (champion)
* Zsombor Piros (quarterfinals)
* Thiago Monteiro (semifinals)
* Benoît Paire (first round)
* Fabio Fognini (final)
* Andrea Vavassori (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 | Final | Final | Final | Final |
| 5 | Thiago Monteiro | 2 | 4 | | | | |
| 7 | Fabio Fognini | 6 | 6 | | | | |
| 7 | Fabio Fognini | 6 | 6 | 7 | Fabio Fognini | 2 | 6$^3$ |
| | | | | 3 | Thiago Seyboth Wild | 6 | 7$^7$ |
| 3 | Thiago Seyboth Wild | 4 | | 3 | Thiago Seyboth Wild | 6 | 7$^7$ |
| 8 | Andrea Vavassori | 3$^r$ | | | | | |

### Top 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 |
| 1 | A Shevchenko | 2 | 7$^9$ | 6 | | | | | | | | | | | | | |
| WC | Marcello Serafini | 6 | 6$^7$ | 3 | 1 | A Shevchenko | 6 | 5 | 1 | | | | | | | | |
| Q | C-h Tseng | 6 | 6 | | Q | C-h Tseng | 3 | 7 | 6 | | | | | | | | |
| Q | Federico Iannaccone | 2 | 0 | | | | | | | Q | C-h Tseng | 2 | 1 | | | | |
| | F Maestrelli | 3 | 6 | 3 | | | | | | 5 | T Monteiro | 6 | 6 | | | | |
| Q | L Rottoli | 6 | 3 | 6 | Q | L Rottoli | 3 | 2 | | | | | | | | | |
| | S Travaglia | 2 | 6 | 4 | 5 | T Monteiro | 6 | 6 | | | | | | | | | |
| 5 | T Monteiro | 6 | 1 | 6 | | | | | | | | | | 5 | T Monteiro | 2 | 4 |
| 4 | Z Piros | 7$^7$ | 6 | | | | | | | | | | | 7 | F Fognini | 6 | 6 |
| | A Pellegrino | 6$^0$ | 3 | | 4 | Z Piros | 6 | 3 | 6 | | | | | | | | |
| | K Jacquet | 4 | 0 | | | F Passaro | 3 | 6 | 2 | | | | | | | | |
| | F Passaro | 6 | 6 | | | | | | | 4 | Z Piros | 4 | 4 | | | | |
| | S Caruso | 3 | 6 | 3 | | | | | | 7 | F Fognini | 6 | 6 | | | | |
| Q | G Oradini | 6 | 1 | 6 | Q | G Oradini | 0 | 3 | | | | | | | | | |
| | V Vacherot | 5 | 4 | | 7 | F Fognini | 6 | 6 | | | | | | | | | |
| 7 | F Fognini | 7 | 6 | | | | | | | | | | | | | | |

### 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 |
| 6 | B Paire | 7$^7$ | 4 | 3 | | | | | | | | | | | |
| LL | M Zekić | 6$^2$ | 6 | 6 | LL | M Zekić | 3 | 4 | | | | | | | |
| | M Gigante | 3 | 1 | | | S Napolitano | 6 | 6 | | | | | | | |
| | S Napolitano | 6 | 6 | | | | | | | S Napolitano | 5 | 3 | | | |
| WC | E Dalla Valle | 0 | 6 | 1 | | | | | 3 | T Seyboth Wild | 7 | 6 | | | |
| Q | Andrea Picchione | 6 | 1 | 6 | Q | A Picchione | 4 | 6$^7$ | | | | | | | |
| | R Bonadio | 6 | 6$^5$ | 1 | 3 | T Seyboth Wild | 6 | 7$^9$ | | | | | | | |
| 3 | T Seyboth Wild | 4 | 7$^7$ | 6 | | | | | | | | | 3 | T Seyboth Wild | 4 |
| 8 | A Vavassori | 7$^7$ | 6 | | | | | | | | | | 8 | A Vavassori | 3$^r$ |
| | D Ajduković | 6$^3$ | 2 | | 8 | A Vavassori | 6 | 6 | | | | | | | |
| WC | G Fonio | 6$^5$ | 6 | 3 | | F Agamenone | 1 | 2 | | | | | | | |
| | F Agamenone | 7$^7$ | 4 | 6 | | | | | 8 | A Vavassori | 6 | 6 | | | |
| Q | H Habib | 6 | 7$^7$ | | | | | | 2 | F Coria | 0 | 3 | | | |
| | ND Ionel | 3 | 6$^5$ | | Q | H Habib | 4 | 3 | | | | | | | |
| | N Serdarušić | 5 | 4 | | 2 | F Coria | 6 | 6 | | | | | | | |
| 2 | F Coria | 7 | 6 | | | | | | | | | | | | |