2009 Chennai Open – Singles

Mikhail Youzhny was the defending champion, but chose not to participate that year.

Marin Čilić won in the final 6–4, 7–6(7–3), against Somdev Devvarman.

Seeds
• # 🇷🇺 Nikolay Davydenko (second round, withdrew due to a left heel injury)

• # Stanislas Wawrinka (first round)

• # Marin Čilić (champion)

• # Ivo Karlović (quarterfinals)

• # 🇩🇪 Rainer Schüttler (semifinals, withdrew due to a wrist injury)

• # 🇪🇸 Carlos Moyá (second round)

• # 🇷🇸 Janko Tipsarević (quarterfinals)

• # 🇪🇸 Marcel Granollers (semifinals)

Seeds
• # 🇮🇹 Flavio Cipolla (qualified)

• # Michael Berrer (qualifying competition)

• # 🇹🇭 Danai Udomchoke (qualified)

• # 🇺🇸 Rajeev Ram (qualified)

• # 🇩🇪 Alexander Kudryavtsev (qualifying competition)

• # Michel Koning (first round)

• # 🇩🇪 Alexander Satschko (qualifying competition)

• # 🇰🇷 Kyu Tae Im (qualifying competition)

Qualifiers
• # 🇮🇹 Flavio Cipolla

• # 🇮🇳 Rohan Bopanna

• # 🇹🇭 Danai Udomchoke

• # 🇺🇸 Rajeev Ram