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Floyd Mayweather has confirmed he will next face Mexican welterweight Robert Guerrero on May 4.
That fight could clear the way for Sheffield fighter Kell Brook to re-organise his world title tilt clash with Devon Alexander.
Earlier this month, unbeaten five-weight world champion Mayweather had hinted he was close to reaching an agreement to fight IBF welterweight title holder Alexander.
It was an announcement that came days after Alexander had pulled out of fighting mandatory challenger Brook, a bout that was supposed to take place this weekend but was postponed for the second time when the American cited a bicep injury.
Any hopes of the clash being re-arranged were in jeopardy thanks to Mayweather's announcement although the 35-year-old seems to have had a change of heart.
He will now square off against Guerrero - himself a three-weight world champion - on May 4 in his first fight on American television network Showtime instead of HBO, which had followed the 35-year-old for his entire career.
Writing on his official Facebook and Twitter pages, Mayweather said: "Floyd "Money" Mayweather Inks Record-Breaking Deal With Showtime/CBS.
"The first mega-event is taking place on May 4, 2013, when Mayweather will fight Robert Guerrero."
It is likely Mayweather will step back down to welterweight after beating Miguel Cotto for the WBA light-middleweight title by unanimous decision in May last year, a victory that extended the American's record to 43-0 (26 KOs).
It was his only fight last year and came before he served a two-month prison sentence in a misdemeanour domestic battery case.
Guerrero (31-1-1) impressively beat former WBC champion Andre Berto in November but will be a firm underdog against the pound-for-pound best fighter in the world.