2019 Challenger ATP Cachantún Cup – Singles

Marco Cecchinato was the defending champion but chose not to defend his title.

Hugo Dellien won the title after defeating Wu Tung-lin 5–7, 7–6(7–1), 6–1 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇪🇸 Pablo Andújar (semifinals)

• # 🇧🇴 Hugo Dellien (champion)

• # 🇧🇷 Thiago Monteiro (quarterfinals)

• # 🇧🇷 Rogério Dutra Silva (third round)

• # 🇦🇷 Facundo Bagnis (third round)

• # 🇮🇹 Alessandro Giannessi (quarterfinals)

• # 🇪🇸 Pedro Martínez (quarterfinals)

• # 🇪🇸 Daniel Gimeno Traver (third round)

• # 🇦🇷 Facundo Argüello (third round)

• # 🇧🇪 Kimmer Coppejans (quarterfinals)

• # 🇮🇹 Matteo Donati (second round)

• # João Domingues (second round)

• # 🇮🇹 Gian Marco Moroni (third round)

• # 🇮🇹 Federico Gaio (third round)

• # 🇧🇷 Thomaz Bellucci (semifinals)

• # 🇸🇰 Andrej Martin (third round)