Mayweather is 46-0-0 which is the best pound-for-pound fighter in the world. But he is 36 now, spent a couple of months in jail and is coming off a long layoff.
Mayweather says he is taking Guerrero seriously.
"I had a chance to see Robert for the first time face Andre Berto. He's a good young fighter, he's good young fighter and I believe we'll give the fans what they want to see," said Mayweather.