| Singles | |
|---|---|
| 2023 AON Open Challenger | |
| Champion |  Thiago Seyboth Wild |
| Runner-up |  Fabio Fognini |
| Score | 6–2, 7–6(7–3) |
Thiago Monteiro was the defending champion [1] 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.
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)| Semifinals | Final | ||||||||||||
| 5 | Thiago Monteiro | 2 | 4 | ||||||||||
| 7 | Fabio Fognini | 6 | 6 | ||||||||||
| 7 | Fabio Fognini | 2 | 63 | ||||||||||
| 3 | Thiago Seyboth Wild | 6 | 77 | ||||||||||
| 3 | Thiago Seyboth Wild | 4 | |||||||||||
| 8 | Andrea Vavassori | 3r | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Shevchenko | 2 | 79 | 6 | |||||||||||||||||||||||
| WC | Marcello Serafini | 6 | 67 | 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 | 77 | 6 | 7 | F Fognini | 6 | 6 | ||||||||||||||||||||
| A Pellegrino | 60 | 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 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | B Paire | 77 | 4 | 3 | |||||||||||||||||||||||
| LL |  M Zekić | 62 | 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 | 67 | |||||||||||||||||||
| R Bonadio | 6 | 65 | 1 | 3 | T Seyboth Wild | 6 | 79 | ||||||||||||||||||||
| 3 | T Seyboth Wild | 4 | 77 | 6 | 3 | T Seyboth Wild | 4 | ||||||||||||||||||||
| 8 | A Vavassori | 77 | 6 | 8 | A Vavassori | 3r | |||||||||||||||||||||
 D Ajduković | 63 | 2 | 8 | A Vavassori | 6 | 6 | |||||||||||||||||||||
| WC | G Fonio | 65 | 6 | 3 | F Agamenone | 1 | 2 | ||||||||||||||||||||
| F Agamenone | 77 | 4 | 6 | 8 | A Vavassori | 6 | 6 | ||||||||||||||||||||
| Q |  H Habib | 6 | 77 | 2 | F Coria | 0 | 3 | ||||||||||||||||||||
 ND Ionel | 3 | 65 | Q | H Habib | 4 | 3 | |||||||||||||||||||||
| N Serdarušić | 5 | 4 | 2 | F Coria | 6 | 6 | |||||||||||||||||||||
| 2 | F Coria | 7 | 6 | ||||||||||||||||||||||||
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