Ohara Davies overpowered Logan Yoon and forced a seventh-round stoppage at York Hall to progress in the Golden Contract super-lightweight tournament.
'Two Tanks' eased into things in London, sizing up his man, before hammering away with his thunderous right hand to book his semi-final spot.
Davies wins! 🔥 Our final semi finalist is @OharaDavies!— Sky Sports Boxing (@SkySportsBoxing) November 22, 2019
After taking some heavy shots in the 7th round, Logan Yoon retires on his stool
Ohara Davies, Tyrone McKenna, Jeff Ofori & Mohamed Mimoune are our 4 semi finalists 👏👏👏 pic.twitter.com/Xj3jOo1jGt
Yoon did have success of his own but, after a heavy-handed assault in the seventh, the Honolulu man's corner decided he had shipped enough punishment.
Davies told Sky Sports afterwards: "The guy had an amazing chin, I was thinking 'what is going on.'
"I want to get a burger now. The joy I have now is unspeakable joy. This is the humble OD."
Tyrone McKenna comfortably progressed after a wide unanimous decision win over Southern Area champion Mikey Sakyi.
After a closely-fought opening two rounds, the Belfast man maturely took full control and dominated from there, using his levers to control proceedings - taking scores of 100-90 twice and 99-91.
Mohamed Mimoune fought back from an early knockdown to overpower and stop previously unbeaten Darren Surtees inside five rounds.
The Frenchman, who memorably beat Sam Eggington in 2017, showed his level in class to seize control of the quarter-final, damaging the Durham man with body shots before a straight left planted Surtees on the canvas - the referee waving it off.
London's Jeff Ofori - after coming in at just 48 hours notice - edged out Keiran Gething to book his spot in the semis.
The three judges could not split the pair after 10 rounds of nip-and-tuck action, scoring things a draw, the referee deciding Ofori, who was perhaps the busier and more heavy-handed, should progress.
Deontay Wilder vs Luis Ortiz is on Sunday morning at 2am, live on Sky Sports, after Callum Smith vs John Ryder on Saturday night.