2019 Bangkok Challenger – Singles

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

Henri Laaksonen won the title after defeating Dudi Sela 6–2, 6–4 in the final.

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

• # 🇯🇵 Tatsuma Ito (semifinals, retired)

• # Henri Laaksonen (champion)

• # 🇫🇷 Corentin Moutet (second round)

• # 🇯🇵 Yūichi Sugita (third round)

• # 🇦🇺 Marc Polmans (second round)

• # 🇯🇵 Hiroki Moriya (second round)

• # 🇷🇸 Viktor Troicki (third round)

• # 🇰🇿 Aleksandr Nedovyesov (second round)

• # 🇩🇪 Tobias Kamke (quarterfinals)

• # 🇨🇳 Zhang Ze (second round)

• # 🇯🇵 Go Soeda (quarterfinals)

• # 🇮🇹 Gianluca Mager (third round, retired)

• # 🇮🇱 Dudi Sela (final)

• # 🇪🇸 Alejandro Davidovich Fokina (third round)

• # Thiemo de Bakker (third round)