Not only are they two of the better pound-for-pound boxers in the world, but they've also built their careers by using crowd-pleasing styles in the ring.
The bout itself was promoted as boxing's biggest spectacle in history.
Mayweather said before the fight he couldn't be as defensive as he usually is, but had to be in attack mode. It's unlikely that there was any active boxer Mayweather could have fought last week who would have combined to sell more than four million with him. Often regarded as fighting too defensively, Mayweather Jr picked apart his opponent with pressure throughout the fight.
In an interview that followed the fight, Mayweather announced that the occasion would be his very last fight, and that he would retire. I'm not that big an MMA fan.
While the couple, who share a three-month-old son, has not yet gotten married, a report by The Mirror on August 29 revealed that McGregor and Devlin had been together for nine years. But many predicted that the savagery of mixed martial arts would not stand a chance against the sweet science of boxing.
McGregor challenging Mayweather to a fight is somewhat like Michael Phelps challenging Usain Bolt to a race, but unlike racing, boxing and its promoters have always benefited most from sensational stories.
JOE SHOW What time is Joe Ward's World Championships final bout?
"That was our game plan".
Already Mayweather is one of the highest paid sports people of all time. I thought that was a fair play move on my behalf and I came in and I won.
Previously unseen footage has emerged showing Conor McGregor's devastated reaction to losing his mega-fight with Floyd Mayweather. "I got to give respect for that".
"Just coming back around after a whirlwind couple of days". He has a flawless 50-0 (27 KOs) record over a career of more than 20 years. My father loved Floyd since the first day he saw him fighting on the undercard of some boxing event. If I began with a loaded 12 rounds under much stress I would have only hit a brick wall and lost progress as a result and potentially not made the fight.
According to CNBC, Mayweather having $700 million before his fight against McGregor and earning another $300 million afterwards is "hard to imagine", primarily because Forbes estimated that his pre-fight net worth was only $340 million.