Millions tuned into the match between Manny Pacquiao and Floyd Mayweather that ended with a Mayweather victory.
And a huge number turned into amateur sports commentators for this one historic fight between two of the best pound-for-pound boxers of their generation.
The famous flocked to the fight at the MGM Grand in Las Vegas, and many of those who were not there also had an opinion.
Quite a few expressed disappointment, including Mike Tyson:
For more on the fight between Floyd Mayweather and Manny Pacquiao, go here.