if you meen if you are the last player in then your first priority is to assess the situation, if you are in a centre field bunker...MOVE! you need to reduce the angles from which the opposition can attack you and you need to do this as quickly as possible, unless your bunker is big enough to allow you to move around it get out of there!
if its down to 1 on 1, move and shoot to confuse your opponent.....locate him, shoot him in and move....post on where he is and let him pop out to shoot at where you have moved from...then light the sucker up......unless you know you havnt been seen moving its a bad idea to try a mug in a one on one.
if you are seriously out numbered make for a tape or better yet a corner and try your best to lock it down...a bunker touching or very close to the tape is the best bet as it reduces the angles you can be shot from....then post out on the infield side and shoot lanes not players, if you are posted on a gap between 2 bunkers then they have got to come down that way to get you, stay out of sight and post up, use you ears, listen for someone running at your bunker to mug you, listen for the paint in their pots rattling, if this happens lean slightly away from your bunker get your marker angled at the top of the bunker quickly and as soon as anything moves near the top of your bunker open up and pray you hit him first......he has a serious advantage over you but if you are lucky you will take him first.
thats a few ideas but there are plenty more other poeple will sudjest im sure
enjoy!