Britain's Audley Harrison won his second fight in America in impressive style, knocking out Quinn Navarre.
Harrison demonstrated his punching power
The Olympic super-heavyweight champion unleashed a huge straight left to drop the journeyman from Louisiana in the third round.
Harrison had established his jab in the opening round in Miami before landing some hard punches in the next.
Navarre tried to cut Harrison's height and reach advantage with attempts to get inside.
He connected with some left jabs in the second round, but Harrison continued with his jab and rights to the body before his hammer blow ended the contest.
Harrison said: "Once I put him in the corner, I felt I could hurt him
with the left.
"I was ready to go eight rounds but I took advantage of the opportunity to finish it early.
"I was a bit sluggish at first because I haven't boxed in five months. But it didn't take me long to feel more relaxed with my shots."
The win in Miami was Harrison's 11th straight victory since turning professional after winning gold at the Sydney Olympics.
It meant a successful first instalment in a three-fight deal with American TV network ESPN2.
Harrison made his US debut last November, stopping Shawn Robinson in the first round in Atlantic City.
He had failed to win over the British boxing public in his previous contests, partly due to the poor quality of his opponents.
Navarre, 35, had won his last five fights, but lost 10 of the previous 36.
Those losses included a sixth-round defeat by British heavyweight title holder Danny Williams in September 2000.