Chamberlain (17-1-1, 12 KOs) forged a reputation as a big puncher on the British scene but it was still a surprise when he was plucked from relative obscurity and given the chance to perform on a series of high profile Riyadh Season shows two year ago. He grabbed his opportunity with both hands and scored a pair of impressive knockouts before turning in a strange display and losing to Josh Padley.

O’Leary (19-0, 11 KO’s) believes that the attention, fame and purses have sapped Chamberlain’s hunger.

“I think you're in them silk pyjamas,” the 26-year-old Dubliner told Chamberlain Tuesday at their press conference.

“I just want you to show up. That's all. Are you going to show up?”

The pair had been due to face each other in March in O’Leary’s heavily-hyped first professional appearance in Dublin.

Illness forced the Portsmouth man to withdraw and as well as shouldering the expectation of a large home support, O’Leary had to quickly readjust his sights to fight the accomplished veteran, Maxi Hughes.

O’Leary handled the attention brilliantly and produced an excellent display of effective pressure fighting to stop Hughes in the 5th round. The win saw him reach No. 10 in The Ring 140-pound rankings.

He believes that by withdrawing from the initial date, Chamberlain blew any opportunity he may have had.

“I think the only chance you had of coming close to beating me, Mark, was the first one and you missed your chance. The pressure was on me,” he said.

“I've been there. I've done it. It's time to go and do it again. I know the feeling. I know what it's like and I want more of it.”

It does look like the tall, heavy-handed Chamberlain has the style and power to pose the most serious test yet of O’Leary’s credentials and the winner will make themselves a viable contender for a major world title shot.

The powerful, stout Dubliner doesn’t think that that will be the case. He doesn’t even believe that Chamberlain will be the best man he has faced to date.

“I don't believe so, no,” he said.

“I had a harder fight two years ago against an Armenian [a 9th round stoppage of the previously undefeated Hovhannes Matirosyan] and he hasn't fought anyone in the UK since and I doubt anybody wants it.

“For me to have him on my resume and to have done what I done to him, it’s given me not confidence, but goes to show where my skills are at and how far I can go.”