O’Leary vs Chamberlain: UK Time, Ringwalks, Odds & Prediction

Who wins: O'Leary v Chamberlain?

By Ben | Split Decision
Updated: May 26, 2026, 12:00 BST
Published: May 26, 2026, 12:00 BST

Pierce O’Leary (19-0, 11 KOs) finally gets the Mark Chamberlain (17-1-1, 12 KOs) night he was supposed to get back in March. The IBO world super-lightweight title is on the line, the 3Arena in Dublin is the venue, and DAZN carries it globally on Saturday 1 August 2026, with main event ringwalks pencilled in for around 22:00 BST.

How to Watch

Watch Boxing Live on DAZN

Live cards · PPV events · Replays

Watch on DAZN→ Affiliate link

Why O’Leary vs Chamberlain matters

The original March date should have been O’Leary’s homecoming centrepiece. A Dubliner born and raised on Sheriff Street, fifty metres from the 3Arena, was preparing to walk out for his first world title in front of a crowd that had bought the building out months in advance. Then Chamberlain ended up in hospital on an antibiotic drip two weeks from the bell, Maxi Hughes stepped in at short notice, and O’Leary stopped the veteran inside five to claim the vacant IBO belt anyway.

Now Chamberlain gets the second crack. He has spent the four months since watching another man hold the belt he thought he was coming to Dublin to win.

Frank Warren framed it bluntly on announcement day: “This is a fight we simply had to get done. Everyone was so excited by the prospect of it back in March, so we just couldn’t let it pass by.” The Queensberry chairman reckons “all the ingredients are there” for a “barnburner”, and for once the promoter’s pitch is not far from the truth.

Two young 140-pounders can punch, neither man has ever been stopped, and both entered fight week ranked by the WBC. O’Leary sits at No.5, Chamberlain at No.12 in the May 2026 listings, and they are separated by only a year in age and a southpaw stance. As a result, the winner walks out of Dublin with a clearer route toward Dalton Smith’s WBC belt. Have a look at our latest super-lightweight rankings to see where each man sits heading into fight week.

When is O’Leary vs Chamberlain? UK time and date

The fight takes place on Saturday 1 August 2026 at the 3Arena, Dublin. The Queensberry show is titled “No Turning Back” and is O’Leary’s first defence of the IBO belt he won in March. UK broadcast picks up live on DAZN mid-evening, with the main event landing late.

O’Leary vs Chamberlain Full Fight Card

The full undercard has not yet been confirmed by Queensberry. The promotion has stated only that the bill will feature “several Irish fighters” alongside the main event, with chief support and prospect slots typically named four to six weeks out from fight night.

The March 2026 3Arena card carried twelve bouts in total, including the debuts of Irish prospects Bobbi Flood and Adam Olaniyan, so a similar depth of programming is expected.

Where to watch O’Leary vs Chamberlain: TV channel, DAZN and streaming

The card streams live on DAZN in the UK and Ireland. At the time of writing it is listed as a regular DAZN broadcast rather than a separate DAZN PPV, so a standard subscription should cover access unless DAZN announces otherwise closer to fight week.

DAZN also runs an Ultimate tier in the UK, which bundles selected PPVs, minimum 12 per year, at no extra cost. That tier is worth considering if you regularly buy DAZN PPV events. Otherwise, a Standard subscription gives access to 185+ fight nights annually, with PPVs available as paid add-ons.

You can sign up to DAZN through our affiliate link. Same price to you, whilst supporting the site.

O’Leary vs Chamberlain ringwalk UK time

Main event ringwalks are pencilled in for approximately 22:00 BST on Saturday 1 August. The DAZN broadcast is expected to open around 18:00 BST, with chief support landing around 21:00 BST. Final timings depend on undercard finishes and will be confirmed by the broadcaster on fight week.

O’Leary vs Chamberlain Tale of the Tape and Breakdown

Pierce O’Leary:

Mark Chamberlain:

Pierce O’Leary recent form

Mark Chamberlain recent form

O’Leary next fight after Chamberlain

Chamberlain has the slight height edge and the awkward southpaw stance. O’Leary brings the cleaner record, the stronger recent title-level form, and the kind of home advantage that matters in a close fight.

O’Leary has no confirmed follow-up fight. However, the logical target if he wins is WBC super-lightweight champion Dalton Smith, given his current No.5 ranking with the governing body and Chamberlain’s No.12 spot. Frank Warren has also framed the IBO defence as a stepping stone toward a more recognised world title, which makes a Smith fight the obvious route if the timing works.

Realistically, that fight would likely land in late 2026 or early 2027, depending on Smith’s own commitments.

If Chamberlain wins, the world-level path opens up just as cleanly. The Padley loss narrative fades, the Rafferty draw starts to look more like a useful learning fight, and the WBC ranking jumps. Either way, one of the two men leaves Dublin a serious player in a division that is finally beginning to sort itself out. Keep an eye on our boxing schedule for confirmed dates from both camps.

Our analyst’s prediction

O’Leary himself sounds unbothered by the southpaw assignment, saying “we’ll adapt quick – it’s nothing I haven’t seen”, and he had Josh Taylor in his camp as recently as last year sharpening that side of his game.

Tactically, O’Leary needs to seize the centre of the ring early and force Chamberlain backwards, where the left hand has less platform to torque off. Chamberlain, by contrast, has to make this an awkward, mid-range scrap, use his feints to mask entries, and back O’Leary up to give the southpaw cross a clean lane.

If the fight settles into a measured rhythm through six, the home crowd and the reliable Irish jab should carry O’Leary on the cards. However, if Chamberlain lands clean early and tests a chin that nobody has properly tested at this level, the night opens up.

Split Decision backs O’Leary by stoppage, rounds 8-10. The cleaner technical work, the home advantage, and Chamberlain’s question marks at the higher weight tilt this in his favour once he reads the southpaw lines. Still, this is the most dangerous opponent of his career, and years of “Big Bang” momentum cannot quite mask the fact that the Englishman has a real chance.

O’Leary vs Chamberlain odds

Opening odds for the rebooked fight have not yet been widely posted.

UK bookmakers are expected to install O’Leary as a clear favourite, broadly in line with the 2/5 he was quoted at against Hughes in March. Chamberlain is likely to land in the 5/2 to 3/1 range, although this section will be updated once major UK bookmakers price the fight.

Gamble responsibly – 18+ BeGambleAware.org

© Split-Decision.co.uk – all rights reserved.

Tagged