Vitali Klitschko ended Manuel Charr's perfect record with a clinical defence of his WBC heavyweight title in Moscow.
In what could prove to be the Ukrainian's last-ever bout before embarking on a career in politics, a cut over Charr's right eye brought proceedings to an end with 56 seconds remaining in the fourth round.
It was a one-sided contest from the off, with Klitschko stalking the ring behind his jab and landing a couple of early shorts.
He put the former kickboxer down in the second round, landing a left hook which saw Charr counted to eight. And, when a similar shot wounded Charr in the fourth, the referee stepped in.
Charr was disgruntled with the call, kicking the ropes, but the amount of blood he was shedding meant it was impossible for him to carry on.