12 Rounds: Breaking down Mayweather-Berto

— -- It wasn't the fight we would have predicted for unbeaten Floyd Mayweather's 49th and supposed final dance, but his welterweight title bout on Saturday (8 p.m. ET, Showtime PPV) against interim beltholder Andre Berto will have to make do. In the final fight of his landmark six-fight deal with Showtime/CBS, Mayweather (48-0, 26 KOs) has an opportunity to equal the hallowed mark of former heavyweight champion Rocky Marciano. Berto (30-3, 23 KOs) enters as a massive underdog despite being a former two-time titlist. Here's a look at how they match up in 12 different categories.

ROUND 1: Power