And while Horn has made one defense of the championship since then, many believe that Crawford, who is moving up for this opportunity from the junior welterweight division, is the man destined to put a screeching halt to the champ's run that some believe he doesn't deserve.
Referee Robert Byrd stopped the fight with 28 seconds left in the round. Either way, Crawford announced his arrival to the welterweight division and the casual sporting world tonight on ESPN+.
Horn has struggled to make weight previously but his camp was supremely confident about his preparation, saying he was in the best shape of his life and woke up needing to lose only 1kg on Saturday.
And while Horn's trainer Glenn Rushton said Crawford was sharp by remaining patient for counter punches, he didn't think it was as dominating a fight as everyone else. The WBO champion almost went down at the bell to end the eighth.
"Well done, " Horn said, who was finished at 2:33 of the ninth, moments after he suffered a knockdown and a head-rocking left hand. He landed 48 percent of his power shots.
In the five years since I first met him at Pallara State School where the Fighting Schoolteacher was trying to keep the lid on a gaggle of boisterous nine-year-olds, I have never seen him in a bad mood, never heard him raise his voice, never heard him badmouth anyone. "I just had to get in the ring and prove it".
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I've seen him knocked down and hurt and roar back to victory.
"I knew this was coming", he said.
Horn's defence was just too porous.
"He was hard to tag, and he just kept me guessing", Horn said. Errol Spence Jr. is another great, young fighter and a match between he and Crawford would be the unfortunately rare battle of two great, undefeated fighters in their prime. Moreover, Crawford was a lightweight world titleholder in 2014.
He defeated Julius Indongo last August to become the undisputed super lightweight world champion.
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Protesters outside the UK Parliament in central London. A file photograph of justice minister Phillip Lees. Brexit protesters outside Parliament House.
The decision to move up to welterweight had already been made prior to that historic feat.
"Crawford seemed a lot more jumpy today, really unsettled".
Horn was one of three fighters on the card who missed the weight.
The two fighters were originally scheduled to meet April 14, but Crawford injured a hand in training, which resulted in the fight being postponed. Horn might have easily entered the ring last night as a functional middleweight (at least), and on top of that, the Aussie's physical style is such that his opponents usually feel every excess pound over the 147 pound weight limit.
And Horn accused Crawford's promoter, which was also his co-promoter for this bout, of trickery with the scales after he initially failed to make 147 by a half-pound at Friday's official weigh-in.
Terence Crawford has officially crashed the party at 147-pounds.
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