In the press conference officially announcing the fight pitting Floyd Mayweather Jr. against Andre Berto later this year, the challenger accused the undefeated champion of being “boring” and promised an exciting fight in September. 

"Have you ever seen a boring Andre Berto fight? Everyone needs to question Floyd," Berto said in the opening presser for the Mayweather vs. Berto fight. "Every time I fight it's exciting. Every time Pacquiao fights it's exciting. There's one common denominator that's making it [boring]."

Mayweather is undefeated in 48 career fights but only has 26 knockouts to show for in his wins. Considered the top pound-for-pound fighter in the world, he is known more for his top defensive skills rather than his knockout prowess.

Berto, who is expected to enter the fight as a huge underdog, has a career record of 30-3-0 with 23 knockouts and will aim to steal Mayweather’s world titles, the World Boxing Council World Boxing Association welterweight belts.

In the same press conference, Mayweather admitted that he has been hearing some “backlash” for his selection of an unknown Berto but defended the decision saying that Berto is an “exciting” fighter and that the media overhyped Manny Pacquiao, whom he beat last May. The fight in September has been pegged as the last in his career, according to Mayweather himself in previous interviews. 

Berto is just 3-3 in his last six bouts but has won back-to-back fights. He defeated Josesito Lopez last March via technical a knockout and Steve Upsher Chambers in September last year via unanimous decision.

The Mayweather vs. Berto fight is scheduled for Sept. 12, 2015 at the MGM Grand Arena in Las Vegas, the same venue where Mayweather defeated Pacquiao in the bout billed as the “Fight of the Century.” The fight will reportedly cost $75 on pay-per-view.