what is the 2011 performance for the US open?
CREATE TABLE table_15070 (
    "Tournament" text,
    "2009" text,
    "2010" text,
    "2011" text,
    "2012" text
)
SELECT "2011" FROM table_15070 WHERE "Tournament" = 'us open'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the 2011 performance for the US open? ### Input: CREATE TABLE table_15070 (
    "Tournament" text,
    "2009" text,
    "2010" text,
    "2011" text,
    "2012" text
) ### Response: SELECT "2011" FROM table_15070 WHERE "Tournament" = 'us open'