CREATE TABLE table_6652 ("Year" TEXT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

Who won in mixed doubles in 2008?
SELECT "Mixed doubles" FROM table_6652 WHERE "Year" = '2008'
SELECT "Mixed doubles" FROM "table_6652" WHERE "Year" = '2008'