2019 AON Open Challenger – Singles

Lorenzo Sonego was the defending champion and successfully defended his title, defeating Alejandro Davidovich Fokina 6–2, 4–6, 7–6(8–6) in the final.

Seeds
All seeds receive a bye into the second round. • # 🇮🇹 Lorenzo Sonego (champion)

• # 🇪🇸 Albert Ramos Viñolas (semifinals)

• # 🇮🇹 Marco Cecchinato (second round)

• # 🇩🇪 Philipp Kohlschreiber (quarterfinals)

• # 🇪🇸 Roberto Carballés Baena (second round)

• # 🇮🇹 Stefano Travaglia (quarterfinals)

• # 🇪🇸 Jaume Munar (third round)

• # 🇧🇷 Thiago Monteiro (quarterfinals)

• # 🇮🇹 Salvatore Caruso (second round)

• # 🇦🇷 Guido Andreozzi (semifinals)

• # 🇪🇸 Alejandro Davidovich Fokina (final)

• # 🇮🇹 Lorenzo Giustino (second round)

• # 🇭🇺 Attila Balázs (third round)

• # 🇯🇵 Taro Daniel (quarterfinals)

• # 🇧🇪 Kimmer Coppejans (second round)

• # 🇨🇿 Jiří Veselý (third round)