Table schema:
CREATE TABLE table_12266757_1 (mens_singles VARCHAR, mixed_doubles VARCHAR)

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