Marquez said he also feels the need to knockout his opponent to clearly win.
He won't change his style, but he said he will fight "with intelligence" and more aggression, Marquez said.
Roach said his fighter will make sure the pace is more up-tempo.
"I think it's going to be a sensational fight. Juan is the most difficult fighter that Manny Pacquiao has ever faced," Marquez's trainer, Nacho Beristain, said.