2019 Monterrey Challenger – Singles

David Ferrer was the defending champion but chose not to defend his title.

Alexander Bublik won the title after defeating Emilio Gómez 6–3, 6–2 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇺🇸 Tennys Sandgren (semifinals)

• # 🇺🇸 Bradley Klahn (quarterfinals)

• # 🇪🇸 Feliciano López (quarterfinals)

• # 🇳🇴 Casper Ruud (second round)

• # 🇮🇹 Paolo Lorenzi (second round)

• # 🇪🇸 Marcel Granollers (third round)

• # 🇰🇿 Alexander Bublik (champion)

• # 🇨🇦 Peter Polansky (quarterfinals)

• # 🇺🇸 Christopher Eubanks (third round)

• # 🇺🇸 Mitchell Krueger (third round)

• # 🇪🇨 Roberto Quiroz (second round)

• # 🇺🇸 Marcos Giron (quarterfinals)

• # 🇬🇧 James Ward (second round)

• # 🇩🇪 Dominik Köpfer (third round)

• # 🇦🇹 Sebastian Ofner (third round)

• # Darian King (third round)