| Champ: | Nicolás Jarry |
| Runner: |  Juan Ignacio Londero |
| Score: | 7–6(9–7), 6–4 |
| Before Name: | Swedish Open – Singles |
| After Year: | 2021 |
See main article: article and 2019 Swedish Open.
Fabio Fognini was the defending champion, but he chose to compete in Umag instead.
Nicolás Jarry won his first ATP Tour singles title, defeating Juan Ignacio Londero in the final, 7–6(9–7), 6–4.
The top four seeds receive a bye into the second round.
Note: Pablo Carreño Busta, who entered late and played in the qualifying tournament, would have been seeded fifth if he had entered the tournament prior to the initial entry cutoff date of 3 June 2019.