Don Moore, who is believed to be three years Mayweather's junior, is no stranger to Mayweather and was in fact hand picked by the Michigan star for a huge payday which will easily reach eight figures.
Moore has his own business, an apparel company called Fly Native, but if fully focused on the bout.
The eight-round contest will pit Mayweather (50-0, 27 KOs) against undefeated 'Dangerous' Don Moore (18-0-1, 12 KOs) - a man trained by his late uncle Roger Mayweather - on May 14.
But while Mayweather is a household name worldwide, who and what can we expect from Moore?
Firstly, he has spent time in prison and has previously said that boxing saved his life. He was a decorated amateur and is now coached by Kennie Johnson.
The 5ft 10in Moore is from Gary, Indiana and boasts an unbeaten professional record, which began in 1999.
But Moore has been inactive since knocking out DeShaun Williams in September 2016.
Texas-born Williams though had far from an impressive record, losing 20 of his 26 fights. In fact a closer look at Moore's record tells you every fighter he has fought had more defeats than victories on their resumes.
It is safe to say Moore has been very careful picking his opponents down the years. But Moore says he is well prepared and promised an "explosive" fight at the Miami press day this week.
He has never fought outside of the US and he has significantly less round experience than the decorated five-division world champion. In fact Mayweather almost has as many wins (50) as Moore has fought rounds (54).
The Philadephia Eagles fan will have to be on his game if he is to trouble Mayweather, who has shown in training his hand speed remains.
Officially retired for five years, Mayweather has shown his sharpness has not deserted him after his current coach Gerald Tucker released a clip of the two on pads together.
Mayweather and Moore did spar with each other, believed to be in August 2015, in front of a youthful Gervonta Davis.
Mayweather continually goaded his opponent in the gym session, but Moore did look capable in the 19-minute work-out. He caught Mayweather with some shots, but in the whole the champion was in control of the spar before the two touched gloves.
Where and when?
The fight "in the skies of Dubai" will be part of the inaugural edition of The Global Titans Fight Series and will be broadcast live, worldwide, via premium digital-streaming service LiveNow.
What has been said?
Speaking at a press event in Miami on Thursday, Mayweather said: "I am always trying to push the envelope and if something is brought to my attention that has a unique aspect to it, I am always interested.
"Having a fight on the helipad of the Burj Al Arab Hotel in Dubai and the opportunity to be the star of the show is going to be something I will remember always. People all over the world can buy the PPV and watch us fight high above, almost in the sky."
"I am excited to participate in this event," said Moore. "Because of how much of the same training I received from Roger Mayweather, I am gonna be able to give Floyd real problems.
"I have been training hard to show everyone what 'Dangerous' Don Moore is all about and expose Floyd's weaknesses. This is my shot, The time is now, Floyd isn't invincible. Anyone can be beaten."
UFC legend Anderson Silva will face fellow Brazilian fighting star Bruno Machado in an exhibition bout.
While former world champion Badou Jack will face Hany "Egyptian Hurricane" Atiyo.