Deontay Wilder defended his WBC world heavyweight title for the 10th time with a stunning knockout after being out-boxed by Luis Ortiz for six rounds.
The American looked set to see his world-title reign end just short of five years as Ortiz picked him apart for half of their Las Vegas rematch.
But in the seventh round, Wilder's devastating right hand left Ortiz stunned and beaten on the canvas.
"I found my measurement, seen the shot and took it," said Wilder, 34.
"We have Tyson Fury the rematch next. It's set to be done in February so we will see how that goes and then after that I am looking for a unification bout.
Meanwhile Anthony Joshua says he will not be happy with his legacy in boxing if he fails to become a world champion again.
The 30-year-old Briton lost three of the four heavyweight belts to Andy Ruiz Jr in June and the pair will fight again on 7 December in Saudi Arabia.
The former IBF, WBA and WBO champion says in the aftermath of his seventh-round stoppage loss at Madison Square Garden - the first of his career - he quickly returned to training to work on "trial and error" aspects of his craft and things he "wanted to try" without impinging on his defined 12-week training camp.
He also focused on being conditioned to begin sparring instantly in his camp rather than wait until six or seven weeks out from the Diriyah fight and says refining his boxing skills has now become a major focus in his training mix.