What was the surface where the opponent was Nathalie Dechy Meilen Tu?
CREATE TABLE "winner_5" (
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponent_in_the_final" text,
  "score" text
);
SELECT "surface" FROM "winner_5" WHERE "opponent_in_the_final"='nathalie dechy meilen tu';