The 2009 SAP Open was a tennis tournament played on indoor hard courts. It was the 121st edition of the SAP Open, and was part of the International Series of the 2009 ATP Tour. It took place at the HP Pavilion in San Jose, California, United States, from February 9 through February 15, 2009.
The singles draw featured ATP No. 6, 2009 Australian Open semi-finalist and 2009 Dubai finalist Andy Roddick, 2009 Australian Open quarterfinalist and 2008 U.S Open quarterfinalist Juan Martín del Potro, Other names include James Blake, Radek Štěpánek, Mardy Fish, Sam Querrey, Igor Kunitsyn and Robby Ginepri.
| Athlete | Nationality | Ranking* | Seeding | |
|---|---|---|---|---|
| Andy Roddick |  United States | 6 | 1 | |
| Juan Martín del Potro |  Argentina | 7 | 2 | |
| James Blake | United States | 11 | 3 | |
| Radek Štěpánek |  Czech Republic | 21 | 4 | |
| Mardy Fish | United States | 24 | 5 | |
| Sam Querrey | United States | 34 | 6 | |
| Igor Kunitsyn |  Russia | 43 | 7 | |
| Robby Ginepri | United States | 44 | 8 |
*Rankings as of February 9, 2009.
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
Michael Ryderstedt Todd Widom
Andrea StoppiniSee main article: 2009 SAP Open – Singles. Radek Štěpánek defeated Mardy Fish, 3–6, 6–4, 6–2
See main article: 2009 SAP Open – Doubles. Tommy Haas / Radek Štěpánek defeated 
Rohan Bopanna / 
Jarkko Nieminen 6–2, 6–3
