‘The Special One’ put back-to-back losses and an unfocused spell firmly behind him with a crushing stoppage win in front of his home fans.
Brook looked solid early on at the new weight, and before too long connected with a brilliant uppercut which shook the Belarussian to his boots in the second.
The 32 year-old followed it up with a solid right hand and Rabchenko was counted out on the seat of his pants.
IT'S OVER! A straight right hits home and then a huge right uppercut lands and wobbles Rabchenko!
Live on Sky Sports Action or follow it here: https://t.co/jxeA0fF4WE
— Sky Sports Boxing (@SkySportsBoxing) March 3, 2018
With the victory, Brook claimed the WBC Silver title and a top ranking for a possible shot at current ruler Jermell Charlo.
The American had said Brook could face him in June should he win inside six rounds and the Yorkshireman duly obliged.
Whether that fight can happen is down to promoter Eddie Hearn, who is thought to harbor alternative plans for Brook now that he’s back to winning ways.
After the fight, an emotional Brook explained how good it was to have the winning feeling again.
“I’m ‘The Terminator’ and I’ll back! I’m back now with another win. I’m putting everyone on notice and I’m here to stay, I love the sport,” Brook told Sky Sports after what was a tremendous win.
“It was unbelievable (to win again). I was in a dark place at Christmas time and to see all these people turn out and to get myself in shape, my life couldn’t be any better now.
“I’ve not hurt my hands or anything so I’m going to get back in the gym.
“It was all about getting my timing right tonight. I just needed to settle down and time these shots that buckled him. It was the temple shot that done him.”
On settling into the new division, Brook added: “I felt very comfortable.
“I only went up ten pounds from yesterday (to 164) and normally I got way above that, but I just felt comfortable. I felt good in there – strong.
“It was like my first fight tonight with having them losses. I needed to get back to winning ways. The feeling is back again and my confidence has grown.
“I’m going to get back in the gym and I’m back at it. I’m glad I didn’t walk away,” he added.