2019 Slovak Open – Singles

Alexander Bublik was the defending champion but chose not to defend his title.

Dennis Novak won the title after defeating Damir Džumhur 6–1, 6–1 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇰🇿 Mikhail Kukushkin (quarterfinals, retired)

• # 🇭🇺 Márton Fucsovics (second round)

• # 🇮🇹 Stefano Travaglia (quarterfinals)

• # 🇵🇱 Kamil Majchrzak (third round)

• # 🇧🇦 Damir Džumhur (final)

• # 🇦🇺 Alexei Popyrin (second round)

• # 🇮🇹 Salvatore Caruso (third round)

• # Lloyd Harris (quarterfinals)

• # 🇧🇾 Egor Gerasimov (semifinals)

• # 🇫🇷 Antoine Hoang (second round)

• # 🇸🇰 Norbert Gombos (third round)

• # 🇩🇪 Yannick Maden (third round)

• # 🇩🇪 Peter Gojowczyk (third round)

• # 🇨🇿 Jiří Veselý (second round)

• # 🇮🇹 Gianluca Mager (second round)

• # 🇸🇪 Elias Ymer (second round)