CREATE TABLE table_69959 ("Year" FLOAT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

Who won the mixed doubles in 1957 when judy devlin won the women's singles?
SELECT "Mixed doubles" FROM table_69959 WHERE "Women's singles" = 'judy devlin' AND "Year" = '1957'
SELECT "Mixed doubles" FROM "table_69959" WHERE "Women's singles" = 'judy devlin' AND "Year" = '1957'