2018 International Challenger Zhangjiagang – Singles

Jason Jung was the defending champion but lost in the final to Yasutaka Uchiyama.

Uchiyama won the title after defeating Jung 6–2, 6–2 in the final.

Seeds
• # Jason Jung (final)

• # 🇯🇵 Tatsuma Ito (second round)

• # 🇨🇳 Zhang Ze (first round)

• # 🇯🇵 Go Soeda (second round)

• # 🇨🇦 Filip Peliwo (first round)

• # 🇷🇸 Miomir Kecmanović (semifinals)

• # 🇯🇵 Hiroki Moriya (second round)

• # 🇰🇿 Alexander Bublik (semifinals)