2019 Oracle Challenger Series – Newport Beach – Women's singles

Danielle Collins was the defending champion, but chose not to participate as she was still competing at the Australian Open.

Bianca Andreescu won her first WTA 125K series title, defeating Jessica Pegula in the final, 0–6, 6–4, 6–2.

Seeds
All seeds received a bye into the second round. • # 🇸🇪 Rebecca Peterson (quarterfinals)

• # 🇩🇪 Tatjana Maria (semifinals)

• # 🇨🇦 Eugenie Bouchard (quarterfinals)

• # 🇺🇸 Madison Brengle (second round)

• # 🇺🇸 Taylor Townsend (quarterfinals)

• # 🇨🇦 Bianca Andreescu (champion)

• # 🇺🇸 Jessica Pegula (final)

• # 🇷🇺 Sofya Zhuk (second round)

• # 🇨🇿 Marie Bouzková (third round)

• # 🇺🇸 Sachia Vickery (second round, retired)

• # 🇧🇪 Yanina Wickmayer (second round)

• # 🇺🇸 Nicole Gibbs (quarterfinals)

• # 🇯🇵 Misaki Doi (second round)

• # 🇺🇸 Claire Liu (third round)

• # 🇺🇸 Varvara Lepchenko (second round)

• # Jil Teichmann (third round)

Seeds
• # 🇲🇽 Giuliana Olmos (qualified)

• # Alexa Guarachi (qualifying competition)

Qualifiers
• # 🇲🇽 Giuliana Olmos

• # 🇺🇸 Katie Volynets