Amir Khan needed less than four rounds to defeat Billy Dib and claim the WBC international welterweight title in Saudi Arabia on Friday.
The 32-year-old Brit was beaten by Terence Crawford in April but returned to winning ways with a routine triumph against an undersized Dib.
Dib, 33, has won a world featherweight strap but stepped up in weight at late notice after Indian boxer Neeraj Goyat withdrew following a car crash.
An even contest was always unlikely given Dib accepted the fight in June but barely a punch was thrown in an uneventful first round.
Khan stepped up his attack in the second and put Dib on the deck, a sign of what was to come.
And it was in the fourth round that the fight finished, Dib's camp throwing in the towel after a flurry of Khan punches left the Australian on the ropes.
Khan will bank around £7million for his role in the utterly one-sided affair, according to reports.
He is hoping to take on Manny Pacquiao next, potentially in Saudi Arabia again.
"I felt very comfortable in there, I was seeing everything, I was making sure I was picking the right shots," Khan said.
"It was a quick turnaround after the Crawford fight. Whenever I fight I always make it exciting, I always make it very interesting. I want to thank all the fans in Saudi Arabia for coming to the fight and Inshallah we'll be back soon."