2019 Banja Luka Challenger – Singles

Alessandro Giannessi was the defending champion but chose not to defend his title.

Tallon Griekspoor won the title after defeating Sumit Nagal 6–2, 6–3 in the final.

Seeds
All seeds receive a bye into the second round. • # Robin Haase (second round)

• # 🇮🇹 Filippo Baldi (second round)

• # 🇷🇸 Nikola Milojević (second round)

• # 🇦🇷 Federico Coria (quarterfinals)

• # 🇸🇰 Filip Horanský (semifinals)

• # 🇮🇳 Sumit Nagal (final)

• # Tallon Griekspoor (champion)

• # 🇦🇷 Carlos Berlocq (third round)

• # 🇧🇷 Rogério Dutra Silva (second round)

• # 🇷🇸 Peđa Krstin (semifinals)

• # 🇦🇷 Andrea Collarini (third round)

• # 🇦🇺 Christopher O'Connell (second round)

• # 🇰🇿 Dmitry Popko (quarterfinals)

• # Alejandro Tabilo (quarterfinals)

• # 🇷🇸 Danilo Petrović (second round)

• # 🇦🇷 Facundo Mena (quarterfinals)