5 reasons Marquez will beat Pacquiao

LAS VEGAS -- The previous two bouts between Manny Pacquiao and Juan Manuel Marquez offer ample opportunity for in-depth analysis of Saturday's fight at the MGM Grand. The strengths and weaknesses of both fighters are evidenced in the extraordinary 24 rounds that already have been disputed between them, and it's clear even after the years that have passed since then that many of those traits have held up over time and will play a key role in the outcome of the fight ahead.

When they met both times years ago, the fighters appeared evenly matched in key areas, but over time Pacquiao has grown (or at least maintained his skills) more than Marquez in most cases. Based on that assessment, it seems Marquez will have more trouble trying to look good enough to clinch a points victory. Beating Pacquiao will be a tall order, but if Marquez finds a way to pull it off, it likely will be thanks to some combination of these five reasons:

The buck stops here

Last call for history

Surprise factor

Indomitable spirit

Late bloomer

Diego Morilla is a contributor to ESPNdeportes.com.