CREATE TABLE table_5345 ("Year" TEXT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

Who was the men's single in 1940?
SELECT "Men's singles" FROM table_5345 WHERE "Year" = '1940'
SELECT "Men's singles" FROM "table_5345" WHERE "Year" = '1940'