2009 Western & Southern Financial Group Masters – Singles

Roger Federer defeated Novak Djokovic in the final, 6–1, 7–5 to win the men's singles tennis title at the 2009 Cincinnati Masters.

Andy Murray was the defending champion, but lost in the semifinals to Federer.

Seeds
The top eight seeds receive a bye into the second round. • # Roger Federer (champion)

• # 🇪🇸 Rafael Nadal (semifinals)

• # 🇬🇧 Andy Murray (semifinals)

• # 🇷🇸 Novak Djokovic (final)

• # 🇺🇸 Andy Roddick (second round)

• # 🇦🇷 Juan Martín del Potro (withdrew due to fatigue)

• # 🇫🇷 Jo-Wilfried Tsonga (second round)

• # 🇷🇺 Nikolay Davydenko (third round)

• # 🇫🇷 Gilles Simon (quarterfinals)

• # Fernando González (first round, retired)

• # 🇪🇸 Fernando Verdasco (first round)

• # 🇸🇪 Robin Söderling (first round)

• # 🇫🇷 Gaël Monfils (first round)

• # Marin Čilić (second round)

• # 🇪🇸 Tommy Robredo (first round)

• # 🇨🇿 Radek Štěpánek (third round)

Seeds
• # Ivan Ljubičić (qualified)

• # 🇫🇷 Julien Benneteau (qualifying competition, lucky loser)

• # Lu Yen-hsun (qualified)

• # 🇷🇺 Mikhail Youzhny (qualified)

• # 🇰🇿 Andrey Golubev (first round)

• # 🇮🇹 Simone Bolelli (qualified)

• # 🇺🇿 Denis Istomin (qualifying competition)

• # 🇺🇸 Robert Kendrick (first round)

• # 🇷🇺 Teymuraz Gabashvili (first round)

• # 🇨🇿 Jan Hernych (qualified)

• # 🇩🇪 Rainer Schüttler (qualifying competition)

• # 🇫🇷 Adrian Mannarino (qualifying competition)

• # Ernests Gulbis (first round)

• # 🇺🇸 Kevin Kim (qualifying competition)

Qualifiers
• # Ivan Ljubičić

• # 🇵🇱 Łukasz Kubot

• # Lu Yen-hsun

• # 🇷🇺 Mikhail Youzhny

• # 🇦🇺 Chris Guccione

• # 🇮🇹 Simone Bolelli

• # 🇨🇿 Jan Hernych

Lucky loser
• # 🇫🇷 Julien Benneteau