Terence Crawford, regarded by many as the pound-for-pound best fighter in boxing, defended his WBO welterweight title Saturday night in Las Vegas stopping Kell Brook in the fourth round. Brook, a former IBF welterweight champion, started well in the first two rounds but in the fourth he came lunging in and Crawford caught him with a stiff right jab that sent the challenger stumbling to the ropes.

It didn't take long for Crawford, 33, to finish him with the referee stepping in to stop the fight at the 1:14 mark. It was Crawford's fourth title defense as he ran his record to 37-0 with 28 KOs.