CREATE TABLE table_12266757_1 (mens_singles VARCHAR, mixed_doubles VARCHAR)

Who won the Mens Singles when the Mixed doubles went to Stellan Mohlin Kerstin St hl , Aik?
SELECT mens_singles FROM table_12266757_1 WHERE mixed_doubles = "Stellan Mohlin Kerstin Ståhl , AIK"
SELECT "mens_singles" FROM "table_12266757_1" WHERE "Stellan Mohlin Kerstin Ståhl , AIK" = "mixed_doubles"