Mayweather vs. Berto Replay: Detailing Biggest Moments of Championship Fight

Floyd Mayweather Jr. accomplished his goal of making it through 49 fights with an undefeated and perfect record.

He beat challenger Andre Berto Saturday night at the MGM Grand Garden Arena in Las Vegas before a less-than-capacity crowd of 13,395. The victory came by a unanimous decision, and it allowed Mayweather to tie Rocky Marciano's record of also retiring with a perfect 49-0 record

Marciano was a heavyweight champion who ended his career in 1956 and never returned to the ring. He died in a 1969 plane crash.

Mayweather's unbeaten record was never in doubt in his fight against Berto (30-4), because he was quicker and more decisive in his punching, and his defensive skills allowed him to avoid Berto's attempts to string punches together.

Mayweather came out with determination and a somewhat aggressive pace in the first round. He threw some hard right hands, some left jabs to the body and threw a couple of left hooks as well. Those punches gave Mayweather the edge in the first round and set the tone for the fight.

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Berto: "He's sharp. It's hard for me to say [he's the best ever]. I haven't been in the ring with all those guys."

— Chris Mannix (@ChrisMannixSI) September 13, 2015"

Mayweather won a somewhat indifferent second round, but he came out hard once again in the third. He used his jab to keep Berto off balance, and he also fired some hard rights as well. Berto tired to counter with his own jab, but very few of them found the range.

John Locher/Associated Press

Mayweather landed a hard right hand in the fourth round that seemed to hurt Berto, and he grabbed Mayweather after absorbing the punch.

By the end of that round, the pattern for the fight was complete. Mayweather simply beat his opponent to the punch on a consistent basis. That's why Mayweather won the fight by margins of 120-108, 118-110 and 117-111 on the three judges' scorecards.

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These punching statistics are courtesy @CompuBox https://t.co/nNWmy1YC8d

— ESPN Stats & Info (@ESPNStatsInfo) September 13, 2015"

Mayweather credited his opponent for his toughness throughout the bout.

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Mayweather: He Wouldn't Lay Down, It Was a Good Fight http://t.co/RUMkuqMXj4 #boxing

— BoxingScene.com (@boxingscene) September 13, 2015"

In the later rounds, Mayweather continued to throw punches, but he also spent much of his time clowning and dancing in the ring.

Some of that may have been due to an injured hand. ESPN boxing columnist Dan Rafael wrote that Mayweather told his corner that his hand was hurt after the ninth round.

Typical of a Mayweather fight, there were no knockdowns, and neither of the fighters seemed seriously hurt at any time.

However, Mayweather remained in control throughout the fight.

That's something that could be said after each and every one of his 49 fights, and it's why he was able to conclude his career with a perfect record.