who is the opponent when the score is 7–5, 7–6 (8–6)?
CREATE TABLE "singles_7" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "opponent" FROM "singles_7" WHERE "score"='7–5, 7–6 (8–6)';