Jorge Arce

Manny Pacquiao, widely considered the world's best pound-for-pound fighter, is defending his WBO welterweight championship against "Sugar" Shane Mosley on Saturday at the MGM Grand Garden Arena in Las Vegas. The fight marks Pacquiao's second defense of the 147-pound title he won from Miguel Cotto in 2009. The first came against Josh Clottey in March 2010, after which Pacquiao moved up and beat Antonio Margarito for a vacant super welterweight title last November. That victory made Pacquiao the first boxer to capture world championships in eight different weight classes (from 112 to 154).

On December 15, 2012 in Houston, Texas, USA, Nonito "Filipino Flash" Donaire, Jr. successfully retained the WBO and The Ring super bantamweight titles against the Mexican Legend Jorge "Travieso" Arce via third round knock out 2:59 into the round. Donaire floored Arce once in the second round, and once in the third round, before the knockout that ended the match.

Manny Pacquiao is not perfect. He's not unbeatable. He's not impossible to root against. Imagine that. In the last seven months, nothing has quantitatively changed for Pacquiao, who is still on a winning streak and still one of the most insanely famous people in the world. And yet it feels like things are on the precipice of changing. There's no need to trot out the "oh, how the mighty have fallen" cliché for him just yet. But there's something vaguely in flux about the Filipino living legend's aura, and the idea of the mighty falling is suddenly conceivable.