SCHEMA:
CREATE TABLE table_12266757_1 (mens_singles VARCHAR, mixed_doubles VARCHAR)
USER:
Who won the Mens Singles when the Mixed doubles went to Stellan Mohlin Kerstin Ståhl , Aik?

QUERY:
SELECT mens_singles FROM table_12266757_1 WHERE mixed_doubles = "Stellan Mohlin Kerstin Ståhl , AIK"