O'Leary vs Chamberlain

Who won O’Leary vs Chamberlain?

Mark Chamberlain beat Pierce O’Leary by technical knockout in the 10th round on Saturday, August 1st, 2026, at 3Arena, Dublin.

The fight was scheduled to take place over 12 rounds in the Super Lightweight division, which meant the weight limit was 140 pounds (10 stone or 63.5 kg).

Also on the undercard Royston Barney-Smith was victorious over Reece Bellotti, Gary Cully beat Lee Reeves, and Steven Cairns defeated Senan Kelly.

O’Leary vs Chamberlain stats

Pierce O’Leary stepped 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 made 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 suggested Chamberlain had an advantage in power over Leary, with a 71% knockout percentage compared to Leary's 58%.

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

Chamberlain had a height advantage of 1 inch over Leary.

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

Leary was 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 had fought 13 more professional rounds, totaling 114 compared to Chamberlain's 101.

Pierce O’Leary went into the fight ranked number 7 by the WBC, and 10 by the IBF at super lightweight.

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

O’Leary vs Chamberlain form

Leary had won 5 of his most recent fights, stopping 2 of them, going the distance 3 times.

In his last fight before this contest, he had beaten 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 had stopped 3 of his last 5 opponents.

In his last fight leading up to this contest, he had drawn with Jack Rafferty on August 23, 2025 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 activity leading into the fight, Mark Chamberlain had been fighting more than Pierce O’Leary.

Going into this contest, Pierce O’Leary had last fought 4 months and 18 days ago, while Mark Chamberlain's last outing had been 11 months and 9 days ago.

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

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

What time did O’Leary vs Chamberlain start?

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

Who broadcast O’Leary vs Chamberlain?

The DAZN show began at 2:00 PM EST / 11:00 AM PST. The DAZN Global broadcast of the card started at 7:00 PM (BST).

What were the odds on O’Leary vs Chamberlain?

Sorry, we couldn’t find any historical odds for O’Leary vs Chamberlain.