user: Question: what is the 2011 performance for the US Open?
Columns: ['Tournament', '2009', '2010', '2011', '2012']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments', 'Grand Slam Tournaments']
SQL:

assistant: SELECT "2011" FROM "Table" WHERE "Tournament" = 'US Open';