Who won mixed doubles in the 2002 season?
CREATE TABLE "21st_century" (
  "season" real,
  "men_s_singles" text,
  "women_s_singles" text,
  "men_s_doubles" text,
  "women_s_doubles" text,
  "mixed_doubles" text
);
SELECT "mixed_doubles" FROM "21st_century" WHERE "season"=2002;