What was the score of the marco island tournament match when Kathleen Horvath won runner-up?
CREATE TABLE "singles_9_6_3" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "score" FROM "singles_9_6_3" WHERE "outcome"='runner-up' AND "tournament"='marco island';