Deontay Wilder produced a sensational first-round knockout of Dominic Breazeale to defend his World Boxing Council (WBC) heavyweight title in New York in the early hours of Sunday.
Wilder, 33, flattened his fellow American with 43 seconds of the opening round left, taking his record to 41 wins and a draw from 42 bouts.
Breazeale was on the ropes early on before finding a solid shot to respond to the champion.
But Wilder finished the fight moments later with a huge right hand.
It was the 40th victory by knockout for Wilder and just a second career loss for Breazeale, following his 2016 defeat to Anthony Joshua.
With this win, Wilder successfully defended his title for the ninth time, becoming only the 10th man to achieve that consecutive milestone in the heavyweight division.