2020 Bangkok Challenger – Singles

Henri Laaksonen was the defending champion but chose not to defend his title.

Attila Balázs won the title after defeating Aslan Karatsev 7–6(7–5), 0–6, 7–6(8–6) in the final.

Seeds
All seeds receive a bye into the second round. • # 🇨🇿 Jiří Veselý (second round)

• # 🇭🇺 Attila Balázs (champion)

• # Robin Haase (second round)

• # 🇺🇿 Denis Istomin (third round)

• # 🇹🇳 Malek Jaziri (second round)

• # 🇷🇺 Roman Safiullin (semifinals)

• # 🇺🇦 Illya Marchenko (second round)

• # 🇷🇺 Evgeny Karlovskiy (quarterfinals)

• # 🇮🇹 Gian Marco Moroni (semifinals)

• # 🇦🇷 Renzo Olivo (third round)

• # 🇷🇺 Teymuraz Gabashvili (withdrew)

• # Gonçalo Oliveira (second round)

• # 🇨🇴 Santiago Giraldo (third round)

• # 🇺🇸 JC Aragone (third round)

• # Borna Gojo (quarterfinals)

• # 🇩🇪 Daniel Altmaier (second round)