CREATE TABLE table_75956 ("Tournament" CLOB, "2006" CLOB, "2009" CLOB, "2012" CLOB, "2013" CLOB)

What is the 2006 when the 2013 is 2r, and a Tournament was the us open?
SELECT "2006" FROM table_75956 WHERE "2013" = '2r' AND "Tournament" = 'us open'
SELECT "2006" FROM "table_75956" WHERE "2013" = '2r' AND "Tournament" = 'us open'