George Groves knocked out Jamie Cox with a vicious body shot on Saturday night to set up a mouth-watering all-English meeting with Chris Eubank Jr in the semi-finals of the World Boxing Super Series.
Everyone is already talking about Groves v Eubank Jr and it could take place in a London football stadium on January 20.
Eubank Jr, 28, last week produced a stunning third-round knockout to defeat Turkey's Avni Yildirim and sent a message to Groves following his victory.
"I'm here to dominate this tournament," said Eubank Jr. "I'm sending a message out there that I'm coming. George Groves, get through your next fight so we can give the boxing fans what they want to see.
"I think it's going to be exactly the same as what we saw tonight. I'm not playing any more."
The Groves knockout came in the fourth round at the SSE Arena in Wembley but the 29-year-old Londoner had to withstand some heavy pressure from Cox.
It was an efficient performance by Groves to retain his World Boxing Association super middleweight crown and he came face-to-face with Eubank Jr in the ring immediately after the fight.
"I picked him [Cox, in the draw] because I believe he was the most dangerous of the unseeded fighters. I didn't want an easy fight," said Groves. "I knew Jamie Cox would ask questions and I trained alongside him years ago.
"But we roll on to the next geezer, who ever that is."
Groves added that his only regret was that not all the world supermiddleweight champions were signed up for this tournament, including his arch-rival James DeGale, the IBF champion.
Eubank (26-1, 20 KOs) entered the ring to be interviewed after the early finish.
"It was a good fight and he did what he had to do," said Eubank Jr. "It was a nice little body shot."
Groves was pinned to the ropes at times but delivered a stunning body blow which sent the 31-year-old boxer down to all fours.
Cox couldn't beat the count. Watch a video of the paralysing body blow below.