CREATE TABLE table_80380 ("Year" CLOB, "Men's singles" CLOB, "Women's singles" CLOB, "Men's doubles" CLOB, "Women's doubles" CLOB, "Mixed doubles" CLOB)

Who won the Men's singles in the year that Ian Maconachie Marian Horsley won the Mixed doubles?
SELECT "Men's singles" FROM table_80380 WHERE "Mixed doubles" = 'ian maconachie marian horsley'
SELECT "Men's singles" FROM "table_80380" WHERE "Mixed doubles" = 'ian maconachie marian horsley'