Manny Pacquiao says Juan Manuel Marquez won't be able to outrun him because he plans to fight at a faster pace when the two veteran boxers clash for the fourth time on December 8 in Las Vegas.
"He is a good counter-puncher," Pacquiao said of Marquez.
"He is very patient and sits back and waits for action. If I waited for him to throw the punches first, the fight would be boring. That's why I have always been the one to make the fight between us."
Pacquiao, a former eight division world champion, is making big changes to his preparations and his sparring for the non-title fight at the MGM Grand Hotel in Las Vegas.
"I will try not to fight as slow at the end of this fight as I did in the last three fights," Pacquiao said. "That is my focus now. I want to finish stronger in this fight."
The 33-year-old Pacquiao defeated Marquez in a majority decision last year - a third gut-wrenching result for Marquez against his Filipino foe.
In the build-up to that fight, Marquez taunted Pacquiao with claims that he was the true winner of their first two bouts - a 2004 draw and a 2008 rematch.
Hall of Fame trainer Freddie Roach said they were looking at ways to break through Marquez's skilled defence. "We have a tough fight ahead of us," Roach said. "We know that Marquez is a great counter puncher. We are working on things to defeat that counter-puncher style.
"Going by all the tapes we have watched, we do our best when we are more aggressive. More hand speed. We are going to use a lot of that."
Pacquiao said if the opportunity for a knockout was there he would go for it.