2018 Stockholm Open – Singles
| Singles | |
|---|---|
| 2018 Stockholm Open | |
| Champion | Stefanos Tsitsipas |
| Runner-up | Ernests Gulbis |
| Score | 6–4, 6–4 |
| Draw | 28 |
| Seeds | 8 |
Juan Martín del Potro was the two-time defending champion but chose not to defend his title.
Stefanos Tsitsipas won his first ATP World Tour title, defeating Ernests Gulbis in the final, 6–4, 6–4. With the win, he became the first Greek player to win an ATP title in the organization's 48-year history. Gulbis lost his first ATP Tour final, after six singles titles in a row.