Which Surface has a Score of 2009 wta tour?
CREATE TABLE "top_10_wins_per_season" (
  "player" text,
  "ranking" text,
  "event" text,
  "surface" text,
  "round" text,
  "score" text
);
SELECT "surface" FROM "top_10_wins_per_season" WHERE "score"='2009 wta tour';