Pierce O'Leary vs. Mark Chamberlain | DAZN - 1 August 2026

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Queensberry set for Irish return with Pierce O'Leary in the headline role

Hot on the heels of their last successful foray into Ireland, Queensberry Promotions returns to Dublin on August 1.

They will be back at the 3Arena where, on March 14, Anthony Cacace defeated Jazza Dickens via decision in front of a sold-out crowd on a bill that saw the popular junior welterweight Pierce “Big Bang” O’Leary impress against veteran Maxi Hughes.

This time, the 19-0 (11 KOs) O’Leary, 26, will box as the headliner on a show that includes Brian Peters-managed heavyweight prospect Adam Olaniyan, who got off the mark as a professional on the last Dublin bill, 14-0 lightweight Steven Cairns, who stopped Arnie Dawson in nine rounds, and Irish veteran Jono Carroll.

There’s also a spot on the show for 1-0 Dublin hotshot Bobbi Flood, who caught the eye with a 68-second blitzing of experienced Hungarian Bela Istvan Orban, dropping him twice.

Irish heavyweight prospect Olaniyan is also out this weekend, on Queensberry’s Paris bill, against Cameroon-born Andre Youmbi Oyen.

O'Leary's opponent will likely be announced this week.

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According to my friend, his opponent will be Mark Chamberlain.

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Announced: Pierce O'Leary returns to Dublin to fight Mark Chamberlain on August 1st, live on DAZN

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Pierce O'Leary-Mark Chamberlain rescheduled for August 1 in Dublin

Five months after their original meeting was shelved, Pierce O'Leary and Mark Chamberlain will get bigger billing in Dublin.
The junior welterweight pair will headline at Dublin's 3Arena on August 1, Queensberry Promotions announced Tuesday.
Chamberlain (17-1-1, 12 KOs) previously withdrew from their original March 14 date, having suffered an infection which hospitalized the 27-year-old two weeks out. Now fully recovered and set to head back into training camp shortly, he'll look to seize the Irishman's standing after O'Leary stopped Maxi Hughes in five rounds that night.

O'Leary (19-0, 11 KOs) is The Ring's No. 10-rated junior welterweight, while Chamberlain hopes to prove his credentials in a weight class he's growing into, having lost there on debut against Josh Padley in September 2024.

Padley (18-1, 6 KOs) has parlayed that surprise 10-round points win on the Anthony Joshua-Daniel Dubois undercard into a short-notice world title shot at lightweight, before earning a promotional deal with Matchroom and success after moving down in weight.

He's now the European 130-pound beltholder and will make the first defense of that title against Aqib Fiaz on June 6. Chamberlain has only boxed twice since.

The Portsmouth puncher was held to a 12-round majority draw after a thrilling firefight with Jack Rafferty last August in Altrincham and ventures into another opponent's backyard this summer seeking a career-best scalp.

When their fight was first announced, Chamberlain expressed as much.

"I've got gloves," Chamberlain said. "I'll travel and I’ll fight anyone, anywhere. If it makes sense, then why not? All the pressure is on him, I've done it with going up to Manchester and into Jack Rafferty's back garden, so I'll do it again here."

O'Leary was predictably bullish about the assignment when talking to The Ring's John Evans in February.

"Who has he fought at 140?," O'Leary said. "Just Rafferty. Look, he got through it. It was a great fight, a great barnburner for both of them, but I'm no Rafferty, that's the difference. I'm looking forward to it, obviously the southpaw style is awkward, but we'll adapt quick. It's nothing I haven't seen."

O'Leary is the WBC's No. 5-rated contender for Dalton Smith's world title, while the 26-year-old Dubline resident sits at No. 12 with the WBO. Chamberlain is ranked No. 12 by the WBC, so this figures to be an eliminator of sorts between two fan favorites keen to level up as further world-level challenges and more lucrative opportunities await the victor.

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Pierce O'Leary vs. Mark Chamberlain rescheduled for August 1 in Dublin

Pierce O’Leary, will once again look to dazzle the 3Arena in his home city of Dublin on Saturday, August 1, when he fights Mark Chamberlain in a junior welterweight 12-rounder.

The pair were originally set to fight back in March before Chamberlain was forced out through illness. Meanwhile, O’Leary delighted his followers when he defeated substitute Maxi Hughes in the fifth round.

That victory was the first professional appearance in Dublin for the 26-year-old O’Leary, 19-0 (11 KOs). The event sold out, highlighting his popularity.

For southpaw Chamberlain, 17-1-1 (12 KOs), from Waterlooville, this collision with O’Leary will represent his second major assignment at 140lbs after holding Jack Rafferty to draw.

“This is a fight we simply had to get done,” said promoter allegedly via the press release. “Everyone was so excited by the prospect of it back in March, so we just couldn’t let it pass by.

“It is one of those fights where you just know it will deliver. Two young talents, big punchers who don’t take a backward step. All the ingredients are there for a real barnstormer, with a world title on top this time.

“Pierce is spearheading a revival of professional boxing in Dublin, and the reaction to his March homecoming was astounding."

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TYSON FURY RETURN ON AUGUST 1 IN DUBLIN

Tyson Fury has revealed he will return on August 1st in Dublin, Ireland likely on the same card as O’Leary-Chamberlain…

Fury & Joshua now have warmup fights within a week of each other before their clash in November.

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Thomas Carty anyone?

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PIERCE O'LEARY TELLS MARK CHAMBERLAIN: 'I THINK YOU'RE IN SILK PYJAMAS'

Pierce O’Leary believes that Mark Chamberlain has been spoilt by success and is determined to prove it when the junior welterweights meet at Dublin’s 3Arena on August 1.

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.”

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