A week ago today, Floyd Mayweather TKOed Conor McGregor in the 10th round of their much-hyped fight.

According to former ringside physician Darragh O’ Carroll, referee Robert Byrd stopped the fight because McGregor had suffered a traumatic brain injury.

"Byrd’s calculation to call a stoppage was likely not based on signs of fatigue, but rather signs of traumatic brain injury,"O'Carroll told Tonic. "Ataxia, or dizziness and loss of balance, is one of the hallmarks of concussion, a type of mild traumatic brain injury. Fatigue may cause sluggish and slow movements, but does not cause the imbalance and poor coordination exhibited by McGregor in the 10th round. Being wobbly, in the setting of pugilistic trauma, will always be treated as the result of head trauma and not as fatigue. To let a fighter continue on would be grossly negligent.”

Mayweather's on-again-off-again friend 50 Cent jumped on this information to mock McGregor.

LOL DAMN BOY

A post shared by 50 Cent (@50cent) on Sep 2, 2017 at 12:23am PDT

In the run up to his fight with Mayweather, McGregor called 50 Cent "a bitch."

[Related: Conor Mcgregor called out 50 Cent.]

That's something 50 Cent isn't likely to forget.