Who is the opponent for the winner outcome on a hard surface on August 27, 2011?
CREATE TABLE "singles_16_7_titles_9_runners_up" (
  "outcome" text,
  "date" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "opponent" FROM "singles_16_7_titles_9_runners_up" WHERE "outcome"='winner' AND "surface"='hard' AND "date"='august 27, 2011';