Which Date has a Surface of clay, and a Score of 6–3, 5–7, 2–6?
CREATE TABLE "doubles_9_6_titles_3_runner_ups" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "date" FROM "doubles_9_6_titles_3_runner_ups" WHERE "surface"='clay' AND "score"='6–3, 5–7, 2–6';