Which outcome has a Surface of clay and a Score of 4–6, 7–5, 2–6?
CREATE TABLE "singles_22_15_7" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "outcome" FROM "singles_22_15_7" WHERE "surface"='clay' AND "score"='4–6, 7–5, 2–6';