Although you can classify Diaz, Pacquiao and Marquez as being pressure fighters have all have different styles. Diaz is more of an inside brawler like mini George Forman. Marquez is more of a counter puncher and takes advantage of a fighters mistakes. Pacquiao's punches come from the outside and his skills have increased over his last two fights that actually warrent a changing of his previously defined brawler/puncher style that made is offense wreak less.
The knock on Pacquiao was that he was terribly impatient going after a fighter and often took as many shots as he gave. This impatients has changed into a confidence where is desire to reach his oponent is now packed with precision tied together with defensive movements. He doesn't have that imbalance look in his style anymore and he actully looks graceful Marquez's counter style hasn't changed.
Diaz with his inside brawler style will most likely back up Marquez because his counters work better against outside boxing styles, except for Chris John. So I my guess is that Maquez will have to land a lot of shots countering while backing up to get Diaz. Although I have only seen Diaz twice he might have a different approach with Marquez's counter puch style.
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