2015 Japan Women's Open – Singles

Samantha Stosur was the defending champion, but chose not to participate.

Yanina Wickmayer won the title, defeating Magda Linette in the final 4–6, 6–3, 6–3.

Seeds
• #🇪🇸 Carla Suárez Navarro (first round)

• #🇰🇿 Zarina Diyas (second round)

• #🇺🇸 Madison Brengle (quarterfinals)

• #🇺🇸 Alison Riske (first round)

• #🇸🇪 Johanna Larsson (second round)

• #🇺🇸 Christina McHale (semifinals)

• # Ajla Tomljanović (semifinals)

• # Polona Hercog (first round)

Seeds
• #🇨🇿 Kristýna Plíšková (second round)

• #🇷🇴 Patricia Maria Țig (qualifying competition)

• #🇪🇸 María Teresa Torró Flor (qualifying competition; retired)

• #🇨🇳 Wang Yafan (second round)

• #🇷🇺 Alexandra Panova (qualified)

• # Stefanie Vögele (first round)

• #🇯🇵 Risa Ozaki (qualified)

• # Petra Martić (withdrew, still playing in Dalian)

Qualifiers
• # 🇯🇵 Hiroko Kuwata

• # 🇷🇺 Alexandra Panova

• # 🇯🇵 Risa Ozaki

• # 🇯🇵 Naomi Osaka