Lawrence Okolie floored Nikodem Jezewski on three occasions during a second round knockout victory on the Joshua vs Pulev bill at The SSE Arena in Wembley.
Jezewski was floored twice in the first round and it was the bell that saved him.
Lawrence Okolie stopped Nikodem Jezewski in the second round after the third knock down.
Lawrence Okolie swiftly demolished Nikodem Jezewski to stay on course for a WBO cruiserweight title fight next year.
The unbeaten 27-year-old was denied a fight for the vacant WBO belt after Krzysztof Glowacki tested positive for Covid-19, but Okolie made short work of his Polish replacement opponent.
The explosive power in Okolie's fists was evident in the opening minute as he rattled in a right hand before a body shot sent Jezewski to his knees.
A straight right hand then sent shockwaves through Jezewski's legs as he tumbled back to the canvas.
The Polish fighter was floored on three occasions
Okolie would not be denied a quick finish and a right hand sent Jezewski tumbling backwards for a third and final time in the second round.
Promoter Eddie Hearn told Sky Sports: "He would have done the same thing to Glowacki!
"Glowacki, Makabu, Breidis - Okolie will go through the whole cruiserweight division before going to heavyweight!"
In another undercard bout Hughie Fury had bad cuts but garnered victory on points over Mariusz Wach.
AJ versus Pulev in 3rd round now.