Floyd Mayweather will return to the ring on Sept.12 in Las Vegas to fight Andre Berto. The welterweight bout, which has been speculated about for weeks, has been made official, according to TMZ.

The fight will be Mayweather’s 49th of his career, and it could end up being his last. The bout will mark an end to his six-fight deal with Showtime, and the undefeated boxer has stated multiple times that he intends to retire at the conclusion of his contract.

There has been speculation that the fight will be televised on CBS, as opposed to pay-per-view. It would arguably be the most prominent boxing event on network television in decades.

Mayweather last fought on May 2, defeating Manny Pacquiao in a unanimous decision. The fight was the most profitable pay-per-view of all time, generating an estimated 4.4 million buys and earning Mayweather at least $220 million. The 38-year-old is currently the WBA, WBC, lineal, and The Ring title holder. He was stripped of his WBO welterweight belt. He is considered boxing's best pound-for-pound fighter. 

Berto isn’t expected to give Mayweather much of a challenge. The 31-year-old has won his last two bouts, but he’s lost three of his last six fights.