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The 32-year-old Brit took control from the start and seemed to wobble the 41-year-old Russian numerous times from the opening bell.
But while Povetkin was on shaky legs on several occasions, he stayed up on his feet and kept firing back. Until the end came with a pulverising left hook.
Early on, Whyte was understandably slightly cagey about committing to following up, as he was winning the pair's original contest in August - until Povetkin's devastating uppercut knocked Whyte out.
That perfect punch was one of the KOs of 2020. But it was Whyte who earned his revenge this year, as a series of right hands - then a final, crunching left hook - sent Povetkin collapsing to the canvas.
:wolf: REDEMPTION FOR WHYTE :wolf:@DillianWhyte stops Alexander Povetkin in the fourth round to gain revenge :punch: #RumbleOnTheRock #PovetkinWhyte2 pic.twitter.com/5TUBq0MfTz
- Sky Sports Boxing (@SkySportsBoxing) March 27, 2021
The battered but brave Russian got to his feet - just as he had in August - but this time referee Victor Loughlin waved it off.
At the same time, the towel was thrown in by Povektin's corner.
Whyte has his revenge, stopping Povetkin a round faster than he'd been knocked out last year, and regained his interim heavyweight championship.
Well done Whyte. Done the right thing, moving his feet instead of blocking. Tired Povetkin out & perfect shots to finish. Huge credit going straight back in for the rematch & facing the demons. :clap:- Shane McGuigan (@McGuigans_Gym) March 27, 2021
The Brit's record now stands at 28-2 (19 KOs), while Povetkin lost for the third time in his long career.
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