Mayweather vs Berto prediction: Who is winning the fight tonight ... and how?

The end of an era?

After 19 years of dominance, Floyd Mayweather's career will ostensibly come to an end TONIGHT (Sat., Sept. 12, 2015) when "Money" takes on the powerful Andre Berto in the main event of a four-fight card at MGM Grand Garden Arena in Las Vegas, Nevada.

MMAmania will deliver LIVE coverage of "Mayweather vs. Berto" later this evening, starting with the Showtime pay-per-view (PPV) broadcast at 8 p.m. ET.

Elsewhere on the main card, newly-crowned 168-pound champion Badou Jack makes his first title defense against English powerhouse George Groves, Super Featherweight bruisers Roman Martinez and Orlando Salido duke it out for a second time, and veteran puncher Jhonny Gonzalez faces Jonathan Oquendo to open proceedings.

Worth almost $80? You tell me.

But, I've ragged on this fight enough. Now it's time to see how it'll go down.

Name: Floyd Mayweather, Jr.
Age: 38
Record: 48-0, 26 KO
Last Five Fights: Manny Pacquiao (UD), Marcos Maidana (UD), Marcos Maidana (MD), Saul Alvarez (MD), Robert Guerrero (UD)
Significant Victories (other than those mentioned above): Juan Manuel Marquez, Ricky Hatton, Oscar de la Hoya, Zab Judah, Jose Luis Castillo (twice), Diego Corrales, Angel Manfredy, Genaro Hernandez

VS.

Name: Andre Berto
Age: 32
Record: 30-3, 23 KO
Last Five Fights: Josesito Lopez (technical knockout), Steve Upsher Chambers (UD), Jesus Soto Karass (technical knockout loss), Robert Guerrero (UD loss), Jan Zaveck (referee technical decision)
Significant Victories (other than those mentioned above): Luis Collazo, Carlos Quintana

THE FIGHT

I have quite a bit of respect for Andre Berto. For all of his faults, he is unquestionably a fighter at heart. He fought Soto Karass effectively one-handed and even managed to knock him down before being stopped in the twelfth round. Before that, he fought through horrifically-swollen eyes against Guerrero. He looks to be in tremendous shape and I have no doubt in my mind that he's coming to fight.

He's just not going to win.

Though he's always had the physical tools, Berto has struggled to put it all together. Against Guerrero, he attempted to mimic Mayweather's shoulder roll with disastrous results. And in his most recent bout with Josesito Lopez, Berto had issues with the smaller man before catching him with a good punch.

Further, while Showtime has touted his punching power, Berto isn't in the same league as Marcos Maidana -- he can pop, sure, but he's not the kind of one-punch threat the network's been pushing him as.

Not like it would matter, though, because Berto does not have the ring-cutting or adaptability to put that power to good use. Really, he doesn't have any of the tools necessary to exploit the few flaws Mayweather has demonstrated.

In all likelihood, Berto has one or two decent rounds before Mayweather completely figures him out and cruises to victory. His chin's not quite shoddy enough for Mayweather to crack it, so expect another agonizingly dull decision win for "Money."

Prediction: Mayweather via unanimous decision