2019 Sibiu Open – Singles

Dragoș Dima was the defending champion but lost in the first round to Václav Šafránek.

Danilo Petrović won the title after defeating Christopher O'Connell 6–4, 6–2 in the final.

Seeds
All seeds receive a bye into the second round. • # Pedro Sousa (third round)

• # Blaž Rola (quarterfinals)

• # 🇭🇺 Attila Balázs (withdrew)

• # 🇪🇸 Pedro Martínez (second round)

• # 🇷🇸 Nikola Milojević (second round)

• # 🇦🇷 Federico Coria (third round)

• # Robin Haase (second round)

• # 🇩🇪 Rudolf Molleker (second round)

• # João Domingues (second round)

• # 🇦🇷 Facundo Argüello (second round)

• # Tallon Griekspoor (second round)

• # 🇸🇰 Filip Horanský (second round)

• # 🇰🇿 Dmitry Popko (second round)

• # 🇦🇺 Christopher O'Connell (final)

• # 🇷🇸 Peđa Krstin (third round)

• # 🇪🇸 Bernabé Zapata Miralles (second round)