2019 Seoul Open Challenger – Singles

Mackenzie McDonald was the defending champion but chose not to defend his title.

Kwon Soon-woo won the title after defeating Max Purcell 7–5, 7–5 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇦🇺 Jordan Thompson (withdrew)

• # 🇱🇹 Ričardas Berankis (third round)

• # 🇺🇦 Sergiy Stakhovsky (third round)

• # 🇨🇦 Brayden Schnur (second round)

• # 🇸🇰 Lukáš Lacko (third round)

• # Jason Jung (second round)

• # 🇨🇾 Marcos Baghdatis (second round)

• # 🇷🇺 Evgeny Donskoy (third round)

• # 🇦🇺 Alex Bolt (quarterfinals)

• # 🇮🇳 Ramkumar Ramanathan (third round)

• # 🇰🇷 Kwon Soon-woo (champion)

• # 🇯🇵 Tatsuma Ito (quarterfinals)

• # 🇷🇸 Nikola Milojević (semifinals)

• # 🇧🇪 Ruben Bemelmans (second round)

• # 🇯🇵 Hiroki Moriya (second round)

• # 🇯🇵 Yūichi Sugita (second round)