The days of speculation for Floyd Mayweather Jr.’s next bout are over, as Showtime Sports made an official announcement through their social media accounts today:

The fight will take place at the MGM Grand Garden Arena in Las Vegas on Sept 12. The match-up had been rumored for the last several months, and was thought to be broadcast on CBS television — but today’s announcement only listed it as available via pay-per-view.

Mayweather Jr, who is 48-0 as a professional, also sent along the news via Twitter and Instagram:

The boxer has previously stated his intention to not surpass Rocky Marciano’s 49-0 undefeated professional record, so it’s possible this will be the last bout of his career — or, at least, that’s what we’ve been led to believe.

His opponent, Andre Berto, is a welterweight from Florida of Haitian origins — who enjoys dual citizenship.

Berto, who is 30-3 as a professional, also sent a celebratory message on his Twitter account:

Berto is currently riding a two-fight win streak. In 2011, he and Victor Ortiz, another recent Mayweather opponent, engaged in a memorable battle which was many observer’s choice for “Fight of the Year.” Berto, who had earned a 27-0 record prior, lost via unanimous decision.

Ortiz and Berto were scheduled to rematch in 2012, but that was scratched when Berto tested positive for banned substances — a result that was later determined to be in error.

No undercard has been announced for the Mayweather vs. Berto event.