Anthony Joshua was taken the distance for the first time in his professional career before winning a unanimous points decision in his world heavyweight title unification fight with Joseph Parker in Cardiff on Saturday.
After 12 rounds, Britain's Joshua triumphed 118-110, 118-110, 119-109 on the three judges' scorecards.
Victory extended the London 2012 Olympic champion' perfect professional record to 21 wins from as many bouts but all of his previous successes had been by way of knockouts.
It also saw International Boxing Federation, International Boxing Organization and World Boxing Association champion Joshua add Parker's World Boxing Organisation belt to his collection.
This result was New Zealand boxer Parker's first defeat in his 25-fight pro career.
Saturday's contest in front of a 78,000 capacity crowd at the Principality Stadium was the first time two previously undefeated heavyweight champions had met for a world title in Britain.
“I was supposed to be in with the fastest heavyweight in the world and I beat him to the majority of punches,” Joshua said.
“He’s supposed to be a strong puncher and I took some of his shots. The ref went to break at one point and he swung a big left hook and caught me. It didn’t do me any damage.
“He was supposed to knock me out tonight and it didn’t happen. Forget the humble sh*t - I did hurt him a few times and I bust his eye as well.”
Parker disagreed with Joshua's take n the fight.
“He didn’t really hurt me. He hurt me with the headbutt I think!” Parker said. “That’s why I got the cut. But he didn’t really [hurt me].”
Parker gave Joshua the closest inspection of his boxing skills of his professional career, forcing the 28-year-old to adopt an unfamiliar, restrained style.
But trainer Rob McCracken sang the praises of his “mature” performance and Joshua himself admitted he had to show restraint throughout because of the counter-punching threat Parker posed.
Joshua's win should move him closer to a bout against Deontay Wilder, who holds the World Boxing Council's version of the heavyweight title.