2019 Tennis Championships of Honolulu – Singles

Nao Hibino was the defending champion, but chose not to participate.

Usue Maitane Arconada won the title, defeating Nicole Gibbs in the final, 6–0, 6–2.

Seeds
• # 🇺🇸 Whitney Osuigwe (quarterfinals)

• # 🇺🇸 Nicole Gibbs (final)

• # 🇯🇵 Ayano Shimizu (first round)

• # 🇦🇺 Arina Rodionova (second round)

• # 🇺🇸 Usue Maitane Arconada (champion)

• # 🇯🇵 Risa Ozaki (second round)

• # 🇨🇳 Zhang Yuxuan (first round)

• # 🇮🇱 Deniz Khazaniuk (second round)