| Champ: |  Matteo Berrettini |
| Runner: |  Félix Auger-Aliassime |
| Score: | 6–4, 7–6(13-11) |
| Draw: | 28 (4 / 3) |
| Seeds: | 8 |
| Type: | singles doubles |
| Before Name: | MercedesCup – Singles |
| After Name: | MercedesCup – Singles |
| Main Name: | Stuttgart Open |
| After Year: | 2021 |
See main article: 2019 MercedesCup.
Roger Federer was the defending champion, but chose not to participate this year.
Matteo Berrettini won the title, defeating Félix Auger-Aliassime in the final, 6–4, 7–6(13-11). Berrettini did not lose serve through 50 service games in the tournament.[1]
The top four seeds receive a bye into the second round.