Crawford outclassed Julius Indongo, who brought the IBF and WBA belts with him, and scored a vicious knockout at the 1:38 mark of the third round to become boxing's first undisputed champion since Jermain Taylor in 2005.
Crawford landed the bout's first meaningful punch, a counter left hand, about a minute into the first round and looked more comfortable than the frenetic Indongo, who was bolting in and out but not connecting on any shots.
The American floored his Namibian opponent to claim all four major world titles - the WBC, WBA, WBO and IBF belts.
Crawford and trainer Brian McIntyre noticed when studying Indongo that he threw wide shots, so they devised a plan to throw straight shots to the body.
Before falling to Crawford near his hometown, Indongo burst upon the global boxing scene by beating two world champions on their home turf in back-to-back bouts.
The finish came via a huge body shot that left Indongo sprawled on the canvas in agony unable to beat the count.
A super fight down the road at welterweight between Crawford and Spence is starting to bubble and could be a massive event with the proper build-up.
"I feel great. I feel like I hardly even fought", Crawford said.
Saturday, Aug. 19, Top Rank returns to ESPN from the Pinncale Bank Arena in Lincoln, Neb., for Crawford vs. Indongo. "It's been a rough, tough camp and everything we worked on today in camp came out in the fight". We are awaiting the announcement of his rematch "Down Under' against Jeff Horn, and if the Filipino star can negate the challenge of the WBO welterweight champion, Crawford vs Pacquiao starts making sense again".
Coming off the back of an impressive win against Danny Garcia in March, "One Time" is out for the rest of 2017 after having surgery on an injured right elbow, however with Crawford likely to take a warm-up fight in the interim, this fight is a real possibility in 2018 with Thurman himself looking for options.