2021 Stockholm Open – Singles
| Singles | |
|---|---|
| 2021 Stockholm Open | |
| Champion | Tommy Paul |
| Runner-up | Denis Shapovalov |
| Score | 6–4, 2–6, 6–4 |
| Draw | 28 |
| Seeds | 8 |
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.