2019 Milex Open – Singles

Cristian Garín was the defending champion but chose not to defend his title.

Juan Pablo Varillas won the title after defeating Federico Coria 6–3, 2–6, 6–2 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇦🇷 Federico Delbonis (third round)

• # 🇧🇴 Hugo Dellien (semifinals)

• # 🇦🇷 Leonardo Mayer (second round)

• # 🇧🇷 Thiago Monteiro (semifinals)

• # 🇦🇷 Guido Andreozzi (third round, retired)

• # 🇮🇳 Sumit Nagal (second round, retired)

• # 🇦🇷 Facundo Bagnis (quarterfinals)

• # 🇦🇷 Federico Coria (final)

• # 🇮🇹 Federico Gaio (third round)

• # 🇪🇸 Pedro Martínez (second round)

• # 🇮🇹 Alessandro Giannessi (quarterfinals)

• # 🇪🇸 Mario Vilella Martínez (third round)

• # 🇦🇷 Facundo Mena (second round)

• # 🇷🇸 Peđa Krstin (second round)

• # 🇦🇷 Andrea Collarini (third round)

• # 🇨🇴 Daniel Elahi Galán (second round)