| Champ: |  Adrian Mannarino |
| Runner: |  Jack Draper |
| Score: | 7–6(8–6), 2–6, 6–3 |
| Draw: | 28 (4 / 3) |
| Seeds: | 8 |
| Type: | singles doubles |
| Before Name: | Sofia Open – Singles |
| After Name: | Sofia Open – Singles |
| Main Name: | ATP Sofia Open |
See main article: article and 2023 Sofia Open.
Adrian Mannarino defeated Jack Draper in the final, 7–6(8–6), 2–6, 6–3 to win the singles tennis title at the 2023 Sofia Open. It was his third ATP Tour singles title of the season and the fifth of his career.
Marc-Andrea Hüsler was the defending champion,[1] but lost in the first round to Billy Harris after qualifying into the main draw.[2]
The top four seeds received a bye into the second round.