If this is really it for Floyd Mayweather Jr., the undefeated champion did what he was supposed to do in his final fight—thoroughly dominate.

Mayweather easily defeated Andre Berto by unanimous decision (120-108, 118-110, 117-111) before a crowd of 13,395 at the MGM Grand Garden Arena in Las Vegas on Saturday night. With the victory, Mayweather, 38, matched the 49-0 mark of heavyweight legend Rocky Marciano, but once again insisted that he won't attempt a 50th win.

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"My career is over. It's official," Mayweather said in the ring after cruising to the win as expected.

Mayweather unconventionally traded shots with Berto throughout the bout, shedding his usual approach as counter puncher. The offensive-minded tactic drew plenty cheers from the crowd.

While there's a healthy portion of fight fans who believe there will be a 50th fight for Mayweather, what they saw tonight was another dominant performance from the champ. Oh yeah, he of course took home a $32 million paycheck in the process.

Will this be the end of his legendary career?

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 (Photo: Ezra Shaw/Getty Images)