2018 Stockton Challenger – Women's singles

Sofia Kenin was the defending champion, but chose not to participate.

Madison Brengle won the title, defeating Danielle Lao in an all-American final, 7–5, 7–6(12–10).

Seeds
• # 🇺🇸 Madison Brengle (champion)

• # 🇺🇸 Jessica Pegula (semifinals)

• # 🇷🇺 Sofya Zhuk (semifinals)

• # 🇨🇿 Marie Bouzková (second round)

• # 🇺🇸 Kristie Ahn (first round)

• # 🇺🇸 Jamie Loeb (second round)

• # 🇧🇷 Beatriz Haddad Maia (first round)

• # 🇺🇸 Lauren Davis (second round)