Undefeated mandatory challenger George Kambosos is promising to do a real number on IBF, WBC Franchise, WBA, WBO lightweight world champion Teofimo Lopez.

At the moment, the lightweight division is one of the hottest weight classes in the sport.

Besides Lopez, there are big names like Ryan Garcia, Gervonta Davis and Devin Haney.

Some observers have dubbed the 135-pound foursome as the modern day 'four kings' - a reference to the 1980s when Sugar Ray Leonard, Roberto Duran, Marvin Hagler and Tommy Hearns were fighting each other.

Kambosos wants to eliminate Lopez and then take down the other "three kings" - Garcia, Davis and Haney.

The Triller app, who secured the promotional rights to Lopez-Kambosos, are finalizing the event details.

"What's a king to an emperor? A king might rule one land but the emperor will come over and rule many lands. They can be the 'four kings' no problem but the emperor is coming and coming to rule America. I've already ruled Australia, I came over to the UK and ruled there. Now I'm coming over to rule the US and destroy the supposed top leader, their king, the guy who is holding it down for them," Kambosos told The Sun.

"I've earned it the hardest way. Lopez has all the belts, he's beat three former or world champions, the second guy is myself, I've beaten two former world champions. Devin Haney has only beaten one, and Gamboa was shot as ever, Ryan Garcia hasn't beaten a world champion yet. Davis, he's all over the place, he's at 130, so he's not really in the mix at 135.

"I've had to earn this the hard way. I've been overseas, the US, preparing all over the world with hard sparring sessions. This has been well earned, everything that has come has been deserving, but now I'm ready for those world titles."