| Champ: |  Roberto Bautista Agut |
| Runner: |  Juan Martín del Potro |
| Score: | 6–1, 4–6, 7–5 |
| Draw: | 28 (4 / 3) |
| Seeds: | 8 |
| Before Name: | ASB Classic |
| After Name: | ASB Classic |
| Main Name: | ATP Auckland Open |
See main article: 2018 ASB Classic.
Jack Sock was the defending champion, but lost in the second round to Peter Gojowczyk.
Roberto Bautista Agut won the title, defeating Juan Martín del Potro in the final, 6–1, 4–6, 7–5.
The top four seeds received a bye into the second round.