2018 Korea Open – Singles

Jeļena Ostapenko was the defending champion, but lost in the second round to Ekaterina Alexandrova.

Kiki Bertens won the title, defeating Ajla Tomljanović in the final, 7–6(7–2), 4–6, 6–2.

This tournament was the last in Agnieszka Radwańska's career. The former world No. 2 played the final match of her professional career in the second round, when she lost to Irina-Camelia Begu in straight sets.

Seeds
• # Jeļena Ostapenko (second round)

• # Kiki Bertens (champion)

• # Maria Sakkari (semifinals)

• # 🇸🇰 Magdaléna Rybáriková (first round, retired)

• # 🇧🇪 Alison Van Uytvanck (first round)

• # Hsieh Su-wei (semifinals)

• # 🇷🇴 Irina-Camelia Begu (Quarterfinal)

• # 🇧🇪 Kirsten Flipkens (second round)

Seeds
• #🇩🇪 Mona Barthel (qualified)

• # Arantxa Rus (qualifying competition)

• # Jil Teichmann (qualified)

• #🇦🇺 Arina Rodionova (first round)

• #🇬🇧 Harriet Dart (first round)

• #🇦🇺 Priscilla Hon (qualified)

• # 🇪🇸 Sílvia Soler Espinosa (qualifying competition)

• # Bibiane Schoofs (qualifying competition)

• #🇦🇺 Jaimee Fourlis (first round)

• #🇷🇸 Dejana Radanović (qualified)

• #🇷🇺 Varvara Flink (qualified)

• #🇷🇸 Nina Stojanović (first round)

Qualifiers
• #🇩🇪 Mona Barthel

• #🇷🇺 Varvara Flink

• # Jil Teichmann

• #🇷🇸 Dejana Radanović

• #🇰🇷 Han Na-lae

• #🇦🇺 Priscilla Hon