What was the Category after 1991 with a Score of 7-5, 6-7, 6-2?
CREATE TABLE "doubles" (
  "year" real,
  "category" text,
  "champions" text,
  "runners_up" text,
  "score" text
);
SELECT "category" FROM "doubles" WHERE "year">1991 AND "score"='7-5, 6-7, 6-2';