What is the Surface when the score was 4–6, 6–3, 6–7 (5–7)?
CREATE TABLE "singles_9_2_7" (
  "outcome" text,
  "date" text,
  "championship" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "surface" FROM "singles_9_2_7" WHERE "score"='4–6, 6–3, 6–7 (5–7)';