O'Leary vs Chamberlain

When is O’Leary vs Chamberlain?

Pierce O’Leary will face the challenge of Mark Chamberlain on Saturday, August 1st, 2026, at 3Arena, Dublin.

The fight will be contested over 12 rounds in the Super Lightweight division, which means the weight limit will be 140 pounds (10 stone or 63.5 kg).

O’Leary vs Chamberlain stats

Pierce O’Leary steps into the ring with an undefeated record of 19 wins, zero losses, and 0 draws, 11 of those wins coming by way of knockout.

Mark Chamberlain will make his way to the ring with a record of 17 wins, 1 loss and 1 draw, with 12 of those wins by knockout.

The stats suggest Chamberlain has an advantage in power over Leary, with a 71% knockout percentage compared to Leary's 58%.

Pierce O’Leary is the younger man by 1 year, at 26 years old.

Chamberlain has a height advantage of 1 inch over Leary.

Pierce O’Leary fights out of the orthodox stance, while Mark Chamberlain is a southpaw.

Leary is arguably the more experienced fighter, having had the same amount of fights, and made his debut in 2019, 9 months later than Chamberlain, whose first professional fight was in 2018. He has fought 13 more professional rounds, totaling 104 compared to Chamberlain's 91.

Pierce O’Leary goes into the fight ranked number 6 by the WBC, 11 by the IBF, and 10 by The Ring at super lightweight.

Mark Chamberlain is currently ranked number 12 by the WBC in the 140lb division.

O’Leary vs Chamberlain form

Leary remains undefeated as a professional, stopping 2 of his last 5 opponents.

In his last fight, he beat Maxi Hughes on March 14, 2026, by technical knockout in the 5th round at 3Arena, Dublin, Ireland.

Prior to that, he had beaten Liam Dillon on June 7, 2025, by unanimous decision in their 12 round contest at Portman Road, Ipswich, United Kingdom.

Going into that contest, he had won against Darragh Foley on June 28, 2024, by unanimous decision in their 10 round contest at The SSE Arena, Belfast.

Before that, he had beaten Hovhannes Martirosyan on March 16, 2024, by knockout in the 9th round at Resorts World Arena, Birmingham.

He had defeated Kane Gardner on September 23, 2023, by unanimous decision in their 10 round contest at Wembley Arena, Wembley.

Mark Chamberlain has stopped 3 of his last 5 opponents.

In his last fight, he drew Jack Rafferty on August 23, 2025, by majority draw in their 12 round contest in their BBBOC British Super Lightweight and CBC Commonwealth Super Lightweight championship fight at Planet Ice, Altrincham, United Kingdom.

Prior to that, he had been beaten by Josh Padley on September 21, 2024, by unanimous decision in their 10 round contest at Wembley Stadium, Wembley.

Going into that contest, he had won against Joshua Oluwaseun Wahab on May 18, 2024, by technical knockout in the 1st round at Kingdom Arena, Riyadh, Saudi Arabia.

Before that, he had defeated Gavin Gwynne on March 8, 2024, by technical knockout in the 4th round at Kingdom Arena, Riyadh.

He had beaten Artjoms Ramlavs on November 24, 2023, by technical knockout in the 10th round at York Hall, Bethnal Green, United Kingdom.

Activity check

In terms of recent activity, Mark Chamberlain has been fighting more than Pierce O’Leary.

Pierce O’Leary last fought 4 months and 18 days ago, while Mark Chamberlain's last outing was 11 months and 9 days ago.

Leary's last 5 fights have come over a period of 2 years, 10 months and 9 days, which means he has been fighting approximately every 6 months and 27 days. In those fights, he fought a total of 46 rounds, meaning that they have lasted 9.2 rounds on average.

Chamberlain's last 5 fights have come over a period of 2 years, 8 months and 8 days, meaning he has been fighting on average every 6 months and 15 days. In those fights, he fought a total of 37 rounds, meaning that they have lasted 7.4 rounds on average.

What time does O’Leary vs Chamberlain start?

The fighters are expected to ringwalk at around 9:00 PM UTC at 3Arena, Dublin, Ireland, which is 5:00 PM EST or 2:00 PM PST on the West Coast of America, or 10:00 PM BST in the UK.

Who is showing O’Leary vs Chamberlain?

The DAZN show is expected to begin at 2:00 PM EST / 11:00 AM PST. The DAZN Global broadcast of the card is expected to start at 7:00 PM (BST).

How do you stream O’Leary vs Chamberlain?

You can stream O’Leary vs Chamberlain on the DAZN app and platform in the UK and most countries worldwide.
DAZN currently offers boxing fans two packages: Ultimate – includes all pay-per-view events at no extra cost (a minimum of 12 PPVs per year). Standard – includes access to 185+ fights annually, with PPV events available as optional add-ons. The DAZN app is available on Smart TVs, PCs, Apple and Android devices, Fire TV, Roku, and many other platforms.

1 month ultimate (12 month contract) of DAZN UK is £22.99, 1 year ultimate of DAZN UK is £229.99, 1 month (12 month contract) of DAZN UK is £14.99, 1 month (flexible pass) of DAZN UK is £24.99 and 1 year costs £119.99.

You can stream O’Leary vs Chamberlain on the DAZN app and platform in the USA.
DAZN currently offers boxing fans two packages: Ultimate – includes all pay-per-view events at no extra cost (a minimum of 12 PPVs per year). Standard – includes access to 185+ fights annually, with PPV events available as optional add-ons. The DAZN app is available on Smart TVs, PCs, Apple and Android devices, Fire TV, Roku, and many other platforms.

1 month ultimate (12 month contract) of DAZN is $44.99, 1 year ultimate of DAZN is $449.99, 1 month of DAZN is $29.99 and 1 year costs $224.99.

What are the odds on O’Leary vs Chamberlain?

Sorry, we couldn’t find any odds for O’Leary vs Chamberlain yet. If odds are not available initially after the fight is announced, bookmakers usually release them closer to the day of the fight.