What date did Namigata play against Wen-Hsin Hsu in the finals?
CREATE TABLE "singles_14_5_9" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score" text
);
SELECT "date" FROM "singles_14_5_9" WHERE "opponent_in_the_final"='wen-hsin hsu';