Floyd Mayweather
Mayweather will meet Berto in what is likely to be his final fight. Getty

Floyd Mayweather Jnr has confirmed he will fight Andre Berto in what is set to be his final fight on 12 September in Las Vegas. Mayweather, 38, is just one win away from equalling Rocky Marciano's long-standing career record of 49-0 and could bow out of the sport with a win at the MGM Grand.

"September 12, 2015 for number 49. Come be part of the history. Book your hotel and flights now," Mayweather wrote on Instagram alongside a picture of himself and Berto. The September date will be the last fight in the unbeaten American's six-fight contract with Showtime.

Mayweather, who last fought in May when he defeated Manny Pacquiao, has had no shortage of fighters vying to take him on. British fighters Amir Khan and Kell Brook had both hoped to be handed the chance of dethroning the pound for pound welterweight king. Knockout artist Gennady Golovkin has also been eager for the fight, even offering to drop down a weight class to help make it happen.

But Mayweather has decided to settle on the Haitian-American Berto, an announcement that will likely prompt an underwhelming response from boxing fans given his struggles against the elite in the welterweight division. While he is a former WBC world champion, Berto lost the belt after five fights to Victor Ortiz - a former opponent of Mayweather – in 2011.

The 31-year-old won the IBF world title from Jan Zaveck later that year but it was another short lived reign after defeat to Robert Guerrero, another to have fallen to Mayweather, who took the belt off him in his next fight. Berto last fought in March where he recorded victory over Josesito Lopez in California but has lost three of his last six fights dating back to the Ortiz defeat.