Floyd Mayweather Jr. made his professional debut 21 years ago and wasn’t a novice even then, he was a schooled and proven amateur with Olympic silver for credentials. He started as a super featherweight and grew up to (super) welterweight. This time the fight is contracted at light middleweight or 154 lbs., a comfortable limit considering the two years of inactivity/retirement for the boxing superstar.
Conor McGregor has some amateur boxing background but no official boxing fights to his name. He is an MMA phenomenon stretching his skills from 145 lbs to 170 lbs and has provided exciting fights garnished with foul language to keep the masses exhilarated. His strength as a martial artist is striking, especially hand strikes and he excels in his stand-up game against all comers in MMA.