Britain's Jamie McDonnell lost his WBA world bantamweight title in a devastating first-round stoppage defeat by Naoya Inoue in Tokyo.
The 32-year-old got to his feet after a second-minute knockdown from a left hook but unbeaten Inoue pounced soon after to finish the contest.
McDonnell wept after the referee waved the fight off following a flurry of punches from his 25-year-old opponent.
It is the Englishman's first defeat in 10 years.
He had been backed onto the ropes and was unable to respond to the speed and power of a rival nicknamed 'The Monster'.
Doncaster fighter McDonnell - at 5ft 10in - had a five-inch height advantage over the challenger but his size meant making the 8st 6lb weight limit was difficult.
Inoue has earned a reputation as a devastating puncher, having knocked out 13 of his 16 opponents.
He claimed a world title at light-flyweight in his sixth professional bout and moved up to super-flyweight two fights later to pick up another, which he has since defended six times.
The home fighter was priced at 1-6 with bookmakers, and though McDonnell said beforehand he was in "physical and mental shape like never before", he barely landed a punch.