2023 Monterrey Challenger – Singles

Fernando Verdasco was the defending champion but chose not to defend his title.

Nuno Borges won the title after defeating Borna Gojo 6–4, 7–6(8–6) in the final.

Seeds
• # 🇫🇷 Adrian Mannarino (first round)

• # 🇪🇨 Emilio Gómez (second round)

• # 🇺🇸 Denis Kudla (quarterfinals)

• # 🇩🇪 Daniel Altmaier (quarterfinals)

• # 🇺🇸 Christopher Eubanks (first round)

• # Nuno Borges (champion)

• # 🇯🇵 Taro Daniel (second round)

• # 🇯🇵 Yosuke Watanuki (semifinals)