VIDEO: Justin Bieber denied access to the ring after Mayweather win

One security guard at the Mayweather-Berto fight did not have that "Justin Bieber please believe it."

After Floyd Mayweather defeated Andre Berto, TMZ alleges that Justin Bieber was asked to step out of the ring for the post-fight ceremonies.

And then trying to get in was a challenge, thanks to a guard who threatens to handcuff the pop megastar.

Aw. #SadderDay