2019 Bangkok Challenger II – Singles

Marcel Granollers was the defending champion but chose not to defend his title.

James Duckworth won the title after defeating Alejandro Davidovich Fokina 6–4, 6–3 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇮🇳 Prajnesh Gunneswaran (semifinals)

• # 🇯🇵 Tatsuma Ito (second round, retired)

• # Henri Laaksonen (second round, retired)

• # 🇯🇵 Yūichi Sugita (third round)

• # 🇯🇵 Hiroki Moriya (quarterfinals)

• # 🇰🇿 Aleksandr Nedovyesov (second round)

• # 🇩🇪 Tobias Kamke (second round)

• # 🇨🇳 Zhang Ze (third round)

• # 🇯🇵 Go Soeda (quarterfinals)

• # 🇮🇹 Gianluca Mager (quarterfinals, retired)

• # 🇦🇺 Marc Polmans (third round)

• # 🇷🇸 Viktor Troicki (third round)

• # 🇮🇱 Dudi Sela (semifinals)

• # 🇪🇸 Alejandro Davidovich Fokina (final)

• # 🇦🇺 James Duckworth (champion)

• # 🇰🇷 Kwon Soon-woo (third round)