WBO welterweight world champion Brian Norman Jr. defended his strap with a concussive fifth-round knockout of hometown challenger Jin Sasaki on Thursday at Ota City General Gymnasium in Tokyo, Japan. (photos by Naoki Fukuda)

This marked the second successful defense for the 24-year-old Norman (28-0, 22 KOs), an Atlanta native and boxing's youngest male world champion. Sasaki (19-2-1, 17 KOs) saw his nine-fight unbeaten streak end at the hands of Norman, who unleashed a vicious left hook that left him on the canvas for several minutes.