The 2011 SAP Open was a tennis tournament played on indoor hard courts. It was the 123rd edition of the SAP Open, and was part of the ATP World Tour 250 series of the 2011 ATP World Tour. It took place at the HP Pavilion in San Jose, California, United States, from February 7 through February 13, 2011.
On the opening night of the event, Gaël Monfils defeated Pete Sampras 7–6(4), 6–4 in an exhibition match. Gaël Monfils was forced to withdraw with a left wrist injury prior to his semifinal match against Milos Raonic.[1] Following Monfils' withdrawal, Raonic played an exhibition match against Ivo Karlović, who won the match 7–6(3), 7–6(7). Unseeded Raonic eventually faced Fernando Verdasco in the final, and went on to win his first ATP World Tour career title.
| Country | Player | Ranking1 | Seeding | |
|---|---|---|---|---|
 Spain | Fernando Verdasco | 9 | 1 | |
 France | Gaël Monfils | 12 | 2 | |
 United States | Sam Querrey | 17 | 3 | |
 Belgium | Xavier Malisse | 44 | 4 | |
| Denis Istomin | 47 | 5 | ||
| Benjamin Becker | 54 | 6 | ||
 Australia | Lleyton Hewitt | 68 | 7 | |
 Japan | Kei Nishikori | 70 | 8 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
See main article: 2011 SAP Open – Singles qualifying.
See main article: 2011 SAP Open – Singles. 
Milos Raonic defeated Fernando Verdasco, 7–6(8–6), 7–6(7–5).
See main article: 2011 SAP Open – Doubles. Scott Lipsky / Rajeev Ram defeated 
Alejandro Falla / Xavier Malisse, 6–4, 4–6, [10–8].
