2018 Toray 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.

Seeds

 * Rankings are as of September 10, 2018

Other entrants
The following players received wild cards into the main singles draw:
 * 🇧🇾 Victoria Azarenka
 * 🇯🇵 Kurumi Nara
 * 🇨🇿 Kristýna Plíšková
 * Caroline Wozniacki

The following players received entry from the singles qualifying draw:
 * 🇨🇦 Eugenie Bouchard
 * 🇨🇦 Gabriela Dabrowski
 * 🇰🇿 Zarina Diyas
 * 🇯🇵 Misaki Doi
 * 🇯🇵 Nao Hibino
 * 🇺🇸 Alison Riske

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

 * 🇧🇾 Victoria Azarenka

Seeds

 * Rankings are as of September 10, 2018

Other entrants
The following pair received a wildcard into the doubles main draw:
 * 🇯🇵 Erina Hayashi / 🇯🇵 Moyuka Uchijima

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