The former IBF junior welterweight champion made his presence known quickly when he scored a first-round knockout of Phil Lo Greco on Saturday night in Liverpool, England.
What a contrast this was to Khan's last performance, when he was knocked cold by Saul "Canelo" Alvarez, after stepping up two weight divisions, in Las Vegas in May 2016.
The 31-year-old former world champion followed up on the knockdown with an nearly maniacal assault against the ropes: Lo Greco swallowed a couple while slumped backwards before collapsing to his knees under fire. I was a little nervous, but I am back with a big bang. "I want to become a world champion hopefully this year or next year".
This was Khan's first in a three-fight deal with promoter Eddie Hearn, who also works with Brook.
A sold-out Echo Arena, was stunned when Khan dropped Lo Greco with his first meaningful right hand with Lo Greco laid on the canvas.
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Coverage of tonight's boxing bout between Amir Khan and Phil Lo Greco will be shown live on Sky Sports Main Event from 9.45pm tonight. Here's everything you need to know about the big showdown, including full Khan vs Lo Greco live stream details, plus the Khan vs Lo Greco undercard, time, and TV channel.
"All the fans want the fight, he can go in the jungle and chase stars but when he gets in with me he will be seeing stars", Brook said. I'm a 147lb fighter.
"You look at these great fighters like Joshua cleaning up, doing really well, knocking guys out, selling out stadiums and I'm like, "Wow, this is where I want to be again", Khan told a press conference on Thursday. I came here to do a job, do a clinical job and box well.
In Liverpool, at the Echo Arena. I moved up to 150lb for this fight because I've not been in the ring for two years.