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