Who won men's singles when petya nedelcheva diana dimova won women's doubles and vladimir metodiev krasimir yankov won men's doubles?
CREATE TABLE "past_winners" (
  "year" real,
  "men_s_singles" text,
  "women_s_singles" text,
  "men_s_doubles" text,
  "women_s_doubles" text,
  "mixed_doubles" text
);
SELECT "men_s_singles" FROM "past_winners" WHERE "women_s_doubles"='petya nedelcheva diana dimova' AND "men_s_doubles"='vladimir metodiev krasimir yankov';