2021 Singapore Tennis Open – Singles
| Singles | |
|---|---|
| 2021 Singapore Tennis Open | |
| Champion | Alexei Popyrin |
| Runner-up | Alexander Bublik |
| Score | 4–6, 6–0, 6–2 |
| Draw | 28 (4 Q / 3 WC ) |
| Seeds | 8 |
Alexei Popyrin defeated Alexander Bublik 4–6, 6–0, 6–2 to claim his first ATP Tour Men's Singles tennis title at the 2021 Singapore Open. The Singapore Tennis Open was a new addition to the ATP Tour in 2021