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)