2025 Swiss Open Gstaad – Singles
| Singles | |
|---|---|
| 2025 Swiss Open Gstaad | |
| Champion | Alexander Bublik |
| Runner-up | Juan Manuel Cerúndolo |
| Score | 6–3, 4–6, 6–3 |
| Draw | 28 |
| Seeds | 8 |
Alexander Bublik defeated Juan Manuel Cerúndolo in the final, 6–4, 4–6, 6–3 to win the singles tennis title at the 2025 Swiss Open Gstaad. It was his sixth ATP Tour title, and his first on clay. Cerúndolo was contesting his first ATP Tour final since 2021.
Matteo Berrettini was the reigning champion, but withdrew before the tournament began.