What tournament is on 18 May 1992?
CREATE TABLE "doubles_12_9_3" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partnering" text,
  "opponent_in_the_final" text,
  "score" text
);
SELECT "tournament" FROM "doubles_12_9_3" WHERE "date"='18 may 1992';