Couldn't see McGregor landing a glove on him in a boxing match to be honest. Unless Mayweather has seriously regressed since retiring. It would be much more interesting if they had a boxing match using MMA gloves. A full on boxing match will be a stroll in the park for Mayweather, an MMA match would see Mayweather knocked out within seconds.
Mayweather has beaten Pacquiao, Castillo, Cotto, Maidana, Marquez, De La Hoya, Alvarez, Guererro, Mosley, Hatton, Judah, Gatti, Chavez, Coralles, Hernandez.......in a boxing ring. Some of the best and/or toughest boxers of their generation.
Of that list about 2 got close to beating him. He is one of the best defensive technicians of all time and sits up there with the greats. His hand speed is electric, his footwork superb, his reflexes lightning fast, the only thing he lacks in later years is that KO power due to years of hand injuries.
Conor McGreggor is a good boxer by MMA standards but hasn't even been in a ring with a top 50 fighter never mind the best fighter of a generation. It's a mismatch and about nothing more than money. Unless Mayweather has regressed beyond all recognition in 18 months or so then it's an easy nights work for him.
I fell in love with football as I was later to fall in love with women,. Suddenly, uncritically giving no thought to the pain it could bring. - Nick Hornby