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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]
| 2018 Toray Pan Pacific Open | |
|---|---|
| Date | 17–23 September |
| Edition | 35th |
| Category | WTA Premier |
| Draw | 28S / 16D |
| Prize money | $799,000 |
| Surface | Hard / indoor |
| Location | Tachikawa, Tokyo, Japan |
| Venue | Arena Tachikawa Tachihi |
| Champions | |
| Singles | |
 Karolína Plíšková | |
| Doubles | |
 Miyu Kato / Makoto Ninomiya | |
Point distribution
Prize money
| Event | W | F | SF | QF | Round of 16 | Round of 32* | Q2 | 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 | — | — | — | |
| Doubles prize money per team | |||||||||
^* Qualifiers prize money is also the round of 32 prize money
Seeds
| Country | Player | Rank | Seeds |
|---|---|---|---|
 DEN |
Caroline Wozniacki | 2 | 1 |
 FRA |
Caroline Garcia | 4 | 2 |
| JPN |
Naomi Osaka | 7 | 3 |
| CZE |
Karolína Plíšková | 8 | 4 |
 USA |
Sloane Stephens | 9 | 5 |
 ESP |
Garbiñe Muguruza | 14 | 6 |
 AUS |
Ashleigh Barty | 17 | 7 |
| CZE |
Barbora Strýcová | 25 | 8 |
- Rankings are as of September 10, 2018
Other entrants
The following players received wild cards into the main singles draw:
The following players received entry from the singles qualifying draw:
Withdrawals
Mihaela Buzărnescu → replaced by 
Aliaksandra Sasnovich
Angelique Kerber → replaced by 
Belinda Bencic
Madison Keys → replaced by 
Anett Kontaveit
Elise Mertens → replaced by 
Anastasia Pavlyuchenkova
Anastasija Sevastova → replaced by 
Camila Giorgi
Carla Suárez Navarro → replaced by 
Donna Vekić
Retirements
Seeds
| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
| CZE |
Andrea Sestini Hlaváčková | CZE |
Barbora Strýcová | 18 | 1 |
 CAN |
Gabriela Dabrowski |  CHN |
Xu Yifan | 27 | 2 |
 TPE |
Chan Hao-ching | CHN |
Yang Zhaoxuan | 48 | 3 |
| USA |
Raquel Atawo |  GER |
Anna-Lena Grönefeld | 59 | 4 |
- Rankings are as of September 10, 2018
Other entrants
The following pair received a wildcard into the doubles main draw:
Singles
Karolína Plíšková def. 
Naomi Osaka 6–4, 6–4
Doubles
- Miyu Kato / Makoto Ninomiya def. Andrea Sestini Hlaváčková / Barbora Strýcová, 6–4, 6–4
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