O'Leary vs Chamberlain

When is O’Leary vs Chamberlain?

Pierce O’Leary could face the challenge of Mark Chamberlain in Summer 2026 at 3Arena, Dublin.

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

O’Leary vs Chamberlain stats

Pierce O’Leary would step 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 would 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 would have 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.

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

Leary is currently 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 5 by the WBC, 15 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 3 months and 6 days ago, while Mark Chamberlain's last outing was 9 months and 28 days ago.

Leary's last 5 fights have come over a period of 2 years, 8 months and 28 days, which means he has been fighting approximately every 6 months and 19 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, 6 months and 27 days, meaning he has been fighting on average every 6 months and 6 days. In those fights, he fought a total of 37 rounds, meaning that they have lasted 7.4 rounds on average.

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.