| Champ: | Angelique Kerber |
| Runner: |  Ashleigh Barty |
| Score: | 6–4, 6–4 |
| Draw: | 30 (4 / 2) |
| Seeds: | 8 |
| Before Name: | Apia International Sydney – Women's singles |
See main article: 2018 Sydney International.
Johanna Konta was the defending champion, but lost in the first round to Agnieszka Radwańska in a rematch of the previous year's final.
Angelique Kerber won the title, defeating Ashleigh Barty in the final, 6–4, 6–4. Kerber won the title despite being two match points down in the second set in her first-round match against Lucie Šafářová.
The top two seeds received a bye into the second round.