McGregor is seen absorbing a host of punches from his opposition, all the while missing landing almost any on his own, and being beaten for both pace and power.
And some are calling it proof that the Irishman would get destroyed by Mayweather.
"Look how long it takes him to throw some of his own, and how easy it is for his opponent to dodge them. These kind of problems would only get magnified in an actual fight, especially against a supreme defensive talent like Mayweather," Luke Kerr-Dineen, a writer for USA Today said.
It reinforces the point that while there's a minor overlap between MMA and boxing, the stark reality is that the two sports are very different, and they require very different skills.
When asked what he learned in his sparring session with McGregor, Chris Van Heerden said: "That a professional boxer would beat a standup MMA fighter any day.
"Mayweather wins, there's no doubt about it.
