Mayweather vs. Berto Round by Round: How to Catch Live Updates Online

Floyd "Money" Mayweather's legacy is on the line each and every time he steps into the ring, and Saturday night will be no different as he looks to improve his undefeated record to 49-0 against Andre "The Beast" Berto.

The 38-year-old superstar has said on multiple occasions that this will be his final fight, and while many will continue to be skeptical of that declaration, the bout is an important one regardless of whether he fights again since even a single loss would force Mayweather to lose much of his luster.

Few seem to believe that Berto can be the man to hand Mayweather the first defeat of his career, but the massive favorite can't afford to let his guard down, especially against a fighter with as much pure power as the 30-3 Berto possesses.

Berto will look to prevent Mayweather imposing his will on the scorecards as he so often does, but that is easier said than done as his many previous opponents have already found out.

Ahead of Saturday's huge contest, here is everything you need to know about how to follow along on Bleacher Report with live round-by-round updates, as well as the keys to both fighters coming out on top.

Where: MGM Grand Garden Arena in Las Vegas

When: Saturday, Sept. 12 at 8 p.m. ET

Watch: Showtime PPV

Round-by-Round Updates

Follow Bleacher Report's live blog for updates throughout the night as well as round-by-round analysis of the main event between Mayweather and Berto.

Keys and Predictions for Mayweather vs. Berto

Mayweather's Keys to Victory

Mayweather enters Saturday's clash as a massive favorite, which he is no stranger to, and if he wants to maintain his unblemished record then he must simply follow the same blueprint he has for his past several fights.

Earlier in his career, Mayweather was a knockout artist, looking to finish off his opponents. He has evolved over the years, though, and is now content to pick fighters apart by counterpunching and being opportunistic with combinations.

Berto will likely try to throw Mayweather off his game by forcing the issue and going for a knockout, which Mayweather Promotions CEO Leonard Ellerbe believes could force Money to be more aggressive in his own right, according to Sky Sports:

"

We already know we're going to get the best of the best from (Berto), what he's able to do. And one thing you do know is it is guaranteed excitement. ... So with that, I think you're going to see a totally different kind of Floyd, too, because Berto fights in a very aggressive, offensive manner and it kind of forces you to do other things. ... Floyd didn't take a step back in the (Manny) Pacquiao fight, so what makes anybody think he's going to take a step back in this fight? And the other guy's fighting the same kind of way.

"

While Ellerbe's comments are smart in terms of trying to sell the fight, the fact of the matter is that Mayweather fought his brand of fight against Pac-Man, and it was successful just like it was in all of his previous matchups.

Berto is a guy who will press forward and leave himself susceptible to counters, which is where Mayweather does the bulk of his damage. Because of that, Berto seems like the perfect opponent for Money to beat and move to 49-0.

The possibility of getting caught napping with one good shot always exists against someone like Berto, but provided Mayweather is smart and patient in this fight like he usually is, he should pick up a fairly easy decision victory on the scorecards.

Berto's Keys to Victory

There isn't much belief in Berto's ability to pull off one of the greatest upsets in boxing history, but the Miami native isn't lacking in terms of confidence ahead of the biggest fight of his career.

Most figure that Berto took the Mayweather fight for a big payday and the notoriety that comes along with it, but the 31-year-old underdog insists that he has larger aspirations than that:

The odds are very much stacked against Berto as he is 3-3 in his past six fights and is going up against one of the all-time greats, but he firmly believes that a perfect storm could carry him to the biggest victory of his career, per JM Siasat of GMANetwork.com:

"I've gone through so many injuries, trials and tribulations over the past few years but now I know it was all for a reason," Berto said. "... This fight is coming at the perfect time. I'm healthier than I have been in years and everyone is going to see that on Sept. 12. I'm coming to shock the world."

If Berto is going to make good on his belief that he can defeat Mayweather, then his best chance is to go for a fairly quick finish. Mayweather gets better as fights go along, and trying to beat him on the scorecards is an exercise in futility.

Knocking out Mayweather is easier said than done since it has never been done before, but Berto has big-time power as evidenced by the fact that 70 percent of his victories have come by way of knockout.

Mayweather is rarely hit hard or hurt due to his elusiveness, but if Berto is lucky or skilled enough to square him up, then he has a puncher's chance to put him on the canvas.

Berto absolutely needs a knockout in this bout, and while going after one could roll out the red carpet for a Mayweather victory in the end, he is better off going down swinging than allowing Mayweather to dictate the pace of the fight.

Prediction

Mayweather could have taken on any number of opponents in his 49th and supposedly final professional fight, and while some may have given him a better run than Berto, it is difficult to imagine anyone in his weight range beating him at this juncture.

Pacquiao was widely considered to be Money's greatest competition, and while some continue to argue that a shoulder injury is to blame for his performance, the fact of the matter is that Mayweather dominated his Filipino opponent and left no doubt about who the better boxer really is.

Neither Berto nor anyone else is on Pac-Man's level in terms of career accomplishments, which is why picking against Mayweather simply isn't a wise endeavor.

The only way Berto can win this fight is if Mayweather has a poor night after winning the "fight of the century" and takes his opponent too lightly. Based on how focused Mayweather has been over the course of his career, though, that isn't likely to happen.

Mayweather takes great pride in outboxing his opponents and showing them what the sweet science is all about. Look for that to be the case once again Saturday with Mayweather winning via a fairly straightforward unanimous decision.

Follow @MikeChiari on Twitter.