How Mayweather Validated His Sport by Beating McGregor

[ PHOTO: ESPN ]

As mixed martial arts and the UFC (Ultimate Fighting Championship) have grown in popularity in recent years, boxing has fallen to the side in the culture. It's been seen as too rigid, too old-school, too slow for a fast-paced world of fighting within the octagon. The two sports came head-to-head Saturday night when Floyd Mayweather, 40,…