Which tier of the tournament has Mont de Marson in it?
CREATE TABLE "doubles_5" (
  "date" text,
  "tournament" text,
  "surface" text,
  "tier" text,
  "partner" text,
  "opponents_in_the_final" text,
  "score" text
);
SELECT "tier" FROM "doubles_5" WHERE "tournament"='mont de marson';