Who was the opponent in the final in which the court surface was hard and the score was 6–3, 3–6, 7–5?
CREATE TABLE "singles_titles" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score" text
);
SELECT "opponent_in_the_final" FROM "singles_titles" WHERE "surface"='hard' AND "score"='6–3, 3–6, 7–5';