Wladimir Klitschko retained his WBO and IBF heavyweight titles by knocking out challenger Eddie Chambers in Germany.
There were only five seconds left in the 12th round when the Ukrainian sent Chambers to the floor with a left hook.
It was the 33-year-old champion's 48th knockout win in 57 contests and he dominated the fight behind a solid jab against a defensively minded opponent.
"I don't think he ever really hit me, but it wasn't easy. I wanted to be too perfect maybe," Klitschko commented.
The American challenger, known as 'Fast Eddie', had only lost once in 36 previous contests but was conceding five ins in height and 35 lbs in weight.
After an unremarkable opening round, the second saw Chambers, 27, duck and hoist Klitschko on his shoulder before dumping him on the canvas.
The champion responded with a big right later in the round but but was unable to finish the job and the pattern was set for a largely dull encounter with Klitschko, who was in the ring for the first time in 10 months, using his left jab as his main weapon.
Chambers did land a good right in the fifth but it had little effect on the champion and he was content to try and limit the damage, much to the annoyance of his corner.
There was a break at the end of the ninth to allow Chambers to change a split right glove but the breather seemed to benefit Klitschko more.
He pursued Chambers round the ring in the final round looking to land a knockout punch and finally succeeded with a looping left, the referee not even bothering with the formality of a count.
"I have to give him credit, he was fast," Klitschko said.
"He doesn't have much punching power and his game plan was gone by round six."
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