| Champ: |  Tommy Paul |
| Runner: |  Denis Shapovalov |
| Score: | 6–4, 2–6, 6–4 |
| Draw: | 28 |
| Seeds: | 8 |
| Type: | singles doubles |
| Before Year: | 2019 |
| After Year: | 2022 |
See main article: 2021 Stockholm Open.
Tommy Paul defeated defending champion Denis Shapovalov in the final, 6–4, 2–6, 6–4, to win the singles tennis title at the 2021 Stockholm Open. It was Paul's first ATP Tour title.[1]
The top four seeds receive a bye into the second round.