user: Question: What is the 2006 when the 2013 is 2R, and a Tournament was the US Open?
Columns: ['Tournament', '2006', '2009', '2012', '2013']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Australian Open', '1R', '1R', '1R', '1R']
SQL:

assistant: SELECT "2006" FROM "Table" WHERE "2013" = '2R' AND "Tournament" = 'US Open';