Floyd Mayweather to fight Saul Alvarez in September
Unbeaten Floyd Mayweather Jr will fight Saul Alvarez in a light-middleweight unification world title bout on 14 September.
Mayweather took his record to 44 wins when beating Robert Guerrero for the WBC welterweight title on 4 May.
The 36-year-old, who is also the WBA's 'super' light-middleweight champion, will meet undefeated Mexican Alvarez, 22, at the MGM Grand in Las Vegas.
"I'm giving the fans what they want," Mayweather tweeted.
Alvarez, nicknamed 'Canelo' or 'Cinnamon' because of his distinctive red hair, is undefeated in 43 contests and has won 30 fights with knockouts.
He unified the WBC and WBA light-middleweight titles on 20 April in San Antonio with a unanimous victory over Austin Trout.
The fight is reportedly going to be at a catchweight - or non-standard weight limit - of 152lb, two pounds below the light-middleweight limit. But both fighters will put their light-middleweight titles on the line.
It will be Mayweather's second fight since serving two thirds of a three-month prison sentence for domestic violence.