Who were the Opponents in the match on a Hard Surface with Catherine Suire as Partner and Outcome of runner-up?
CREATE TABLE "doubles_6_2_4" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "opponents" FROM "doubles_6_2_4" WHERE "outcome"='runner-up' AND "surface"='hard' AND "partner"='catherine suire';