SELECT "2007" FROM table_63399 WHERE "2010" = '2r' AND "Tournament" = 'us open'
What is the 2007 result when the 2010 result was 2r, at the US Open?
CREATE TABLE table_63399 (
    "Tournament" text,
    "2007" text,
    "2010" text,
    "2011" text,
    "2012" text,
    "2013" text
)