The 2009 Cincinnati Masters (also known as the Western & Southern Financial Group Masters and Western & Southern Financial Group Women's Open for sponsorship reasons) was a tennis tournament played on outdoor hard courts.

It was the 108th edition of the Cincinnati Masters, and was part of the ATP Masters Series of the 2009 ATP World Tour, and of the Premier Series of the 2009 WTA Tour.

1 Kim Clijsters made her return to the Sony Ericsson WTA Tour in Cincinnati.

The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw: The following players received wildcards into the singles main draw The following players received entry from the qualifying draw: The following players received the lucky loser spot: Roger Federer defeated Novak Djokovic 6–1, 7–5.

Cara Black / Liezel Huber defeated Nuria Llagostera Vives / María José Martínez Sánchez, 6–3, 0–6, [10–2].