Oleksandr Usyk has locked horns with the best fighters of his generation – but one stands out above the rest.

The Ukrainian technician is one of only three male two-weight undisputed champions in the four-belt era alongside Naoya Inoue and Terence Crawford.

Usyk is nailed on first ballot Hall of FamerCredit: Getty

He first unified all the titles at cruiserweight by defeating hard-hitting Russian Murat Gassiev in the final of the 2018 World Boxing Super Series tournament.

And then did the same at heavyweight just under six years later when he beat Tyson Fury in their all-action inaugural encounter.

En route to his epic two-fight series with Fury, which concluded in December when Usyk got his hand raised once again, the 38-year-old fought rugged veteran Derek Chisora in his second outing in the glamour division.

Usyk won the bout on points but was pushed all the way by Chisora, who never took a backward step for the full 12 rounds.

It is for this very reason that Usyk reserves the distinction of his toughest-ever opponent for ‘Del Boy’.

“I think it is Derek,” he told talkSPORT.com. “My friend Derek. Hey, Derek I am coming for you!

“Derek is a terrible guy, really tough. It’s just hard [fighting] Derek. He was just very difficult.”

Chisora defeated Otto Wallin earlier this month in his penultimate professional fight.

He is set to have his final bow in London later this year and the British boxing icon wants it to be a rematch with Usyk.

Chisora previously told talkSPORT in November that he was pushing for a crossover clash with Francis Ngannou in Africa.

Usyk defeated Chisora in his first solid heavyweight testCredit: Mark Robinson/Matchroom

Usyk has felt the full force of boxing’s biggest hitters and has the cuts and bruises to show for itCredit: Getty

However, his sights have now shifted to his former foe.

“I think that the Choo Choo train has passed now,” Chisora told talkSPORT.com of a potential showdown with Ngannou.

“The hype for me fighting him has died down. Put it this way, AJ [Anthony Joshua] fighting Francis Ngannou is the same as Canelo [Alvarez] fighting Jake Paul.

“Do you understand? So I think that the gravy train for Francis Ngannou in boxing and trying it doesn’t work…

“My last fight will be in Tottenham [Hotspur Stadium]…I’m pushing for Tottenham.

“I’m not going to say [Usyk]. I’m manifesting it. I’m asking God for the opportunity.

Usyk went on to beat Fury twice in a epic two-fight seriesCredit: Getty

“I’ve said to Frank [Warren], you know, now Oleksandr Usyk has to phone his boss and ask his boss if he can fight me.

“But that’s the fight I want.”

After defeating Chisora, Usyk went on to beat Anthony Joshua in back-to-back bouts before laying waste to Daniel Dubois.

He is now two fights away from retirement and is waiting patiently for the winner of Dubois and Joseph Parker’s IBF title clash on February 22.

“We wait for a fight on February 22 between Daniel and Joseph,” he added.

“Whoever wins this fight between Daniel and Joseph, I have already made the fight.”