2017 Seoul Open Challenger – Singles

Sergiy Stakhovsky was the defending champion but chose not to defend his title.

Thomas Fabbiano won the title after defeating Kwon Soon-woo 1–6, 6–4, 6–3 in the final.

Seeds
• # Lu Yen-hsun (first round)

• # 🇰🇷 Chung Hyeon (withdrew)

• # 🇮🇱 Dudi Sela (quarterfinals, retired)

• # 🇷🇺 Konstantin Kravchuk (first round)

• # 🇨🇦 Vasek Pospisil (second round)

• # Blaž Kavčič (first round)

• # 🇺🇦 Illya Marchenko (first round)

• # 🇧🇪 Ruben Bemelmans (semifinals)