After defeating Manny Pacquiao in the 'fight of the century', Floyd Mayweather will once again be in action on 12 September as he prepares to face Andre Berto, though it has not been received well by experts and critics.

Considering his clash against Berto will be his last bout before he hangs his gloves, fans around the world were expecting Mayweather to choose a superior opponent such as Amir Khan, who was a serious contender to fight the undefeated American. Mayweather has never lost in his professional career.

Mayweather will undoubtedly head into the bout as a huge favourite, while Berto will be the underdog. Berto, who has lost three out his last six fights, might go in as second favourite, but the boxer wants to defy the odds and focussed on the fight.

"Focused, man. I just put in work each and every day to defy the odds," Forbes quoted Berto as saying.

If the 2003 World Amateur Boxing Championships bronze medallist wants to even come close against the pound-for-pound king, he needs to be on top of his game and come up with his best fight in his career so far, which has seen 30 wins in 33 bouts, including 23 knockouts.

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In order to fight against Mayweather in the best shape possible, Berto has started to train under Virgil Hunter , who wants Berto to make the most out of the fight.

"He's locked in, zeroed in. We're taking it a day at a time and we intend to make the most of this," said Hunter. 

"If Floyd's going to win this fight, he's going to have to fight to win it. He's not going to be able to dictate the distance and range to win this fight. He's going to have to fight."

Hunter also believes that the fate of the bout might boil down to certain punches at the MGM Grand in Las Vegas.

"If you can keep him (Mayweather) right there with you, or even a half a thought ahead of you, then you're right there in this fight. Then what it boils down to is a certain punch landing and doing enough damage to hurt him, which he (Berto) can do," said Hunter.

However, Berto is expected to walk out of the fight $3 million richer, while Mayweather could receive in excess of $20 million.