# 2018 Darwin Tennis International – Women's singles

Casey Dellacqua was the defending champion having won the previous edition in 2011, however she had retired from professional tennis in April 2018.
Kimberly Birrell won the title, defeating Ellen Perez in an all-Australian final, 6–3, 6–3.

## Seeds

* Olivia Rogowska (quarterfinals)
* Arina Rodionova (first round)
* Priscilla Hon (withdrew)
* Jaimee Fourlis (first round)
* Jang Su-jeong (first round)
* Katy Dunne (first round)
* Eri Hozumi (first round)
* Destanee Aiava (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final |
| | Kimberly Birrell | 6 | 2 | | | |
| Q | Zuzana Zlochová | 4 | 1$^r$ | | | |
| Q | Zuzana Zlochová | 4 | 1$^r$ | Kimberly Birrell | 6 | 6 |
| | | | | Ellen Perez | 3 | 3 |
| | Ellen Perez | 6 | 6 | Ellen Perez | 3 | 3 |
| WC | Naiktha Bains | 2 | 3 | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | O Rogowska | 6 | 6 | | | | | | | | | | | | | | |
| WC | O Tjandramulia | 4 | 1 | | 1 | O Rogowska | 6 | 6 | | | | | | | | | |
| | G Brescia | 7$^7$ | 7$^7$ | | | G Brescia | 3 | 2 | | | | | | | | | |
| | M Minokoshi | 6$^2$ | 6$^4$ | | | | | | | 1 | O Rogowska | 6$^6$ | 3 | | | | |
| | K Birrell | 6 | 6 | | | | | | | | K Birrell | 7$^8$ | 6 | | | | |
| | R Ozaki | 4 | 1 | | | K Birrell | 6 | 6 | | | | | | | | | |
| Q | M Inglis | 3 | 5 | | 8 | D Aiava | 1 | 1 | | | | | | | | | |
| 8 | D Aiava | 6 | 7 | | | | | | | | | | | | K Birrell | 6 | 2 |
| LL | M Zakarlyuk | 2 | 7$^7$ | 2 | | | | | | | | | | Q | Z Zlochová | 4 | 1$^r$ |
| Q | I Ramialison | 6 | 6$^5$ | 6 | Q | I Ramialison | 4 | 6 | 6 | | | | | | | | |
| | Z Hives | 6 | 4 | 6 | | Z Hives | 6 | 3 | 3 | | | | | | | | |
| | H Kuwata | 2 | 6 | 4 | | | | | | Q | I Ramialison | 5 | 6$^8$ | | | | |
| | A Myers | 6$^3$ | 1 | | | | | | | Q | Z Zlochová | 7 | 7$^{10}$ | | | | |
| Q | Z Zlochová | 7$^7$ | 6 | | Q | Z Zlochová | 6 | 6 | | | | | | | | | |
| Q | K Okamura | 6 | 6 | | Q | K Okamura | 4 | 0 | | | | | | | | | |
| 6 | K Dunne | 4 | 4 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | E Hozumi | 4 | 2 | | | | | | | | | | | | | | | |
| | L Zhang | 6 | 6 | | | L Zhang | 1 | 6 | 6 | | | | | | | | | |
| | S Xu | 6 | 7$^8$ | | | S Xu | 6 | 4 | 2 | | | | | | | | | |
| | E Sema | 2 | 6$^6$ | | | | | | | | L Zhang | 6$^5$ | 3 | | | | | |
| WC | A Bai | 1 | 3 | | | | | | | | E Perez | 7$^7$ | 6 | | | | | |
| | A Sharma | 6 | 6 | | | A Sharma | 6$^4$ | 1 | | | | | | | | | | |
| | E Perez | 6 | 6$^3$ | 6 | | E Perez | 7$^7$ | 6 | | | | | | | | | | |
| 4 | J Fourlis | 4 | 7$^7$ | 3 | | | | | | | | | | | | E Perez | 6 | 6 |
| 5 | S-j Jang | 2 | 6 | 3 | | | | | | | | | | | WC | N Bains | 2 | 3 |
| | D Gálfi | 6 | 1 | 6 | | D Gálfi | 4 | 3 | | | | | | | | | | |
| WC | N Bains | 6 | 7$^7$ | | WC | N Bains | 6 | 6 | | | | | | | | | | |
| | A Tere-Apisah | 2 | 6$^3$ | | | | | | | WC | N Bains | 6$^5$ | 6 | 7$^7$ | | | | |
| | H Kaji | 6 | 6 | | | | | | | | H Kaji | 7$^7$ | 1 | 6$^5$ | | | | |
| WC | K McPhee | 1 | 1 | | | H Kaji | 6 | 6 | | | | | | | | | | |
| | Y-h Lee | 6 | 6 | | | Y-h Lee | 3 | 3 | | | | | | | | | | |
| 2 | Ar Rodionova | 2 | 4 | | | | | | | | | | | | | | | |