What type of surface did they play on 23 October 2000?
CREATE TABLE "wins_17_13" (
  "outcome" text,
  "date" text,
  "championship" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);
SELECT "surface" FROM "wins_17_13" WHERE "date"='23 october 2000';