Victim: Victor Ortiz
When: 9/17/2011

This is probably the most controversial of all KO's considering Mayweather essentially cheap shots Victor Ortiz. Mayweather explained it:

"You gotta protect yourself at all times. I got hit with a head-butt, I got hit with elbows. I didn't cry and complain. I done what I had to do as a fighter. I didn't say my mouth was split open and cut inside. So, keep it clean. We touched gloves. Once we touched gloves, it's fight time."

It's the win that counts. Right?