OUCH: Knockout of the Year?

In addition to all the MMA that took place this weekend, there was also some good old fashioned boxing going down in Atlantic City.

Sergio Martinez successfully defended his WBC middleweight title against Paul Williams, avenging his 2009 loss to Williams in the process. He also damn near killed him.

If this isn't knockout of the year, I'm not sure I want to see the punch that was.

(Skip ahead to about the 4:30 mark.)

(Via Barstool Sports NYC.)