cristiano ronaldo scored eight-minute hat-trick in first half as real madrid thumped granada 9-1 on sunday .
portuguese star helps himself to two more goals in second period to make it five goals in a game .
karim benzema also nets double , while gareth bale grabbed the opener at the santiago bernabeu .
diego mainz scores own goal in second half while roberto ibanez nets consolation for the visitors .
carlo ancelotti 's side now one point behind leaders barcelona in la liga table .