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 18 wins, zero losses, and 0 draws, 10 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 56%.

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's experience as a professional fighter is currently relatively equal to Chamberlain's, having had 1 fewer fights, and made his debut in 2019, 9 months later than Chamberlain, whose first professional fight was in 2018. He has fought 8 more professional rounds, totaling 99 compared to Chamberlain's 91.

Pierce O’Leary goes into the fight ranked number 6 by the WBC, and 15 by the IBF at super lightweight.

Mark Chamberlain is currently ranked number 13 by the WBC in the 140lb division.

O’Leary vs Chamberlain form

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 beaten Joshua Oluwaseun Wahab on May 18, 2024, by technical knockout in the 1st round at Kingdom Arena, Riyadh, Saudi Arabia.

Before that, he had won against 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

Leary's last 4 fights have come over a period of 2 years, 8 months and 28 days, which means he has been fighting approximately every 8 months and 7 days. In those fights, he fought a total of 41 rounds, meaning that they have lasted 10.3 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.