What is the Opponent of the Banja Luka Tournament with a Score of 4–6, 4–6?
CREATE TABLE "runners_up" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "opponent" FROM "runners_up" WHERE "score"='4–6, 4–6' AND "tournament"='banja luka';