| Date: | 17–23 September |
| Edition: | 35th |
| Draw: | 28S / 16D |
| Prize Money: | $799,000 |
| Surface: | Hard / indoor |
| Location: | Tachikawa, Tokyo, Japan |
| Venue: | Arena Tachikawa Tachihi |
| Champs: |  Karolína Plíšková |
| Champd: |  Miyu Kato / Makoto Ninomiya |
| Main Name: | Pan Pacific Open |
The 2018 Toray Pan Pacific Open is a women's tennis tournament played on indoor hard courts. It was the 35th edition of the Pan Pacific Open, and part of the Premier Series of the 2018 WTA Tour. It took place at the Arena Tachikawa Tachihi in Tachikawa, Tokyo, Japan, on 17–23 September 2018.[1] [2]
| Event | Round of 16 | Round of 32 | width=85 | width=85 | width=85 | |||||||
| Singles[3] | 470 | 305 | 185 | 100 | 55 | 1 | 25 | 13 | 1 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 1 |
| width=130 bgcolor=dfe2e9 | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| Singles | $137,125 | $76,063 | $39,080 | $21,010 | $11,265 | $7,150 | $3,447 | $1,750 | |||||||||
| Doubles | $42,850 | $22,900 | $12,510 | $6,365 | $3,460 |
| Country | Player | Rank | Seeds |
|---|---|---|---|
| Caroline Wozniacki | 2 | 1 | |
 France | Caroline Garcia | 4 | 2 |
| Japan | Naomi Osaka | 7 | 3 |
| Czech Republic | Karolína Plíšková | 8 | 4 |
| Sloane Stephens | 9 | 5 | |
 Spain | Garbiñe Muguruza | 14 | 6 |
 Australia | Ashleigh Barty | 17 | 7 |
| Czech Republic | Barbora Strýcová | 25 | 8 |
The following players received wild cards into the main singles draw:
The following players received entry from the singles qualifying draw:
Mihaela Buzărnescu → replaced by 
Aliaksandra Sasnovich
Madison Keys → replaced by 
Anett Kontaveit
Elise Mertens → replaced by 
Anastasia Pavlyuchenkova
Camila Giorgi Carla Suárez Navarro → replaced by Donna Vekić| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Czech Republic | Andrea Sestini Hlaváčková | Czech Republic | Barbora Strýcová | 18 | 1 | |
 Canada | Gabriela Dabrowski |  China | Xu Yifan | 27 | 2 | |
| Chan Hao-ching | China | Yang Zhaoxuan | 48 | 3 | ||
| Raquel Atawo | Anna-Lena Grönefeld | 59 | 4 |
The following pair received a wildcard into the doubles main draw:
See main article: 2018 Toray Pan Pacific Open – Singles.
Karolína Plíšková def. Naomi Osaka 6–4, 6–4See main article: 2018 Toray Pan Pacific Open – Doubles.
Miyu Kato / Makoto Ninomiya def. Andrea Sestini Hlaváčková / Barbora Strýcová, 6–4, 6–4