What is the surface of the match when the opponent was iryna bremond valeria savinykh?
CREATE TABLE "doubles_finals_2_4" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "surface" FROM "doubles_finals_2_4" WHERE "opponents"='iryna bremond valeria savinykh';