Yamaha rider Razgatlioglu completed a hat-trick of wins at the Indonesian venue, but in that situation Bautista only needed to finish third in order to seal the crown ahead of next weekend's Phillip Island finale.
Second place behind the outgoing champion was enough for Bautista to take an insurmountable 66-point advantage over Razgatlioglu, giving the Spaniard his first world championship since he won the 2006 125cc crown.
