CREATE TABLE table_13639 ("Stage" CLOB, "Winner" CLOB, "General classification" CLOB, "Points classification" CLOB, "Mountains classification" CLOB, "Young rider classification" CLOB)

Who was the winner of Stage 9 when then general classification was Danilo Di Luca?
SELECT "Winner" FROM table_13639 WHERE "General classification" = 'danilo di luca' AND "Stage" = '9'
SELECT "Winner" FROM "table_13639" WHERE "General classification" = 'danilo di luca' AND "Stage" = '9'