2009 PTT Thailand Open – Singles

Jo-Wilfried Tsonga was the defending champion, but lost in the semifinals to Viktor Troicki.

Gilles Simon won in the final 7–5, 6–3, against Viktor Troicki.

Seeds
The top four seeds receive a bye into the second round. • # 🇫🇷 Jo-Wilfried Tsonga (semifinals)

• # 🇫🇷 Gilles Simon (champion)

• # 🇺🇸 Sam Querrey (withdrew due to arm injury)

• # 🇷🇸 Viktor Troicki (final)

• # 🇩🇪 Philipp Petzschner (first round)

• # 🇦🇹 Jürgen Melzer (semifinals)

• # 🇫🇷 Fabrice Santoro (first round)

• # 🇺🇸 John Isner (quarterfinals)