CREATE TABLE table_71898 ("Year" FLOAT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

Who won the men's singles in 1999?
SELECT "Men's singles" FROM table_71898 WHERE "Year" = '1999'
SELECT "Men's singles" FROM "table_71898" WHERE "Year" = '1999'