| Champ: |  Marco Cecchinato |
| Runner: |  John Millman |
| Score: | 7–5, 6–4 |
| Draw: | 28 (4 / 2) |
| Seeds: | 8 |
| Type: | singles doubles |
| After Name: | Hungarian Open (tennis) |
See main article: 2018 Gazprom Hungarian Open.
Lucas Pouille was the defending champion,[1] but lost in the second round to John Millman.
Marco Cecchinato won his first ATP title, defeating Millman in the final, 7–5, 6–4. Cecchinato was a lucky loser, the ninth in ATP Tour history to win a title.
The top four seeds received a bye into the second round.