LAS VEGAS — The fact they’re much bigger than when they first met eight years ago is undeniable. Both Manny Pacquiao and Juan Manuel Marquez have added bulk along with the pounds, and both have had to deal with those who suspect they didn’t do it naturally.

Along with the fighters, the purses and attention have grown as Pacquiao and Marquez meet Saturday night for the fourth — and presumably last — time in the rivalry that has served both fighters so well.