CREATE TABLE table_17384 ("Year" FLOAT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

Who won the mixed doubles when ji xinpeng won the mens singles?
SELECT "Mixed doubles" FROM table_17384 WHERE "Mens singles" = 'Ji Xinpeng'
SELECT "Mixed doubles" FROM "table_17384" WHERE "Mens singles" = 'Ji Xinpeng'