What is the lowest Year, when Surface is Hard, and when Opponent is Dinara Safina?
CREATE TABLE "singles_21_17_titles_4_runner_ups" (
  "outcome" text,
  "year" real,
  "championship" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT MIN("year") FROM "singles_21_17_titles_4_runner_ups" WHERE "surface"='hard' AND "opponent"='dinara safina';