Who won the Mens Singles when the Mixed doubles went to Stellan Mohlin Kerstin Ståhl , Aik?
CREATE TABLE "table1_12266757_1" (
  "season" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);
SELECT "mens_singles" FROM "table1_12266757_1" WHERE "mixed_doubles"='Stellan Mohlin Kerstin Ståhl , AIK';