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Dublin clash ends in KO

O'Leary falls to Chamberlain in thriller at 3Arena

Pierce O’Leary was stopped by Mark Chamberlain in the 10th round at Dublin’s 3Arena in a dramatic rematch.
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O'Leary falls to Chamberlain in thriller at 3Arena
Foto: UPI/Bettmann/Al Bello/Getty Images
The essentials
  • O’Leary, IBO world super-lightweight champion, was knocked out for the first time in his career.
  • The fight marked the first meeting between the two fighters after Chamberlain pulled out of their original clash in March.

Pierce O’Leary, the IBO world super-lightweight titleholder, faced a brutal fate at Dublin’s 3Arena last night as he was stopped by Mark Chamberlain in the 10th round. The fight, held in front of a raucous home crowd, saw O’Leary give it his all, but ultimately fell short against Chamberlain’s relentless offense.

A long-awaited clash

O’Leary and Chamberlain had been scheduled to meet earlier in March, but the Brit pulled out of the matchup. That night, O’Leary stopped Jazza Dickens to much fanfare, but the rematch he had promised to fans never materialized until now. With boxing legend Steve Collins on hand, the stage was set for a dramatic showdown that had been months in the making.

The fight was a back-and-forth battle from the start. Chamberlain struck hard in the second round, flooring O’Leary with a left hook. The champion rose, but was knocked down again at the end of the third. O’Leary tried to shift momentum in the fourth, but Chamberlain’s aggression continued to take its toll. As the fight wore on, O’Leary’s nose began to bleed, adding a gruesome element to the action.

Turning point in the seventh

O’Leary found a moment of brilliance in the seventh round, catching Chamberlain with a massive body shot that sent the Brit reeling into the corner. The crowd erupted, with the 3Arena’s atmosphere reaching a fever pitch. That burst of energy proved fleeting, however, as Chamberlain responded with power in the 10th round, finally ending the fight with a decisive knockdown. Despite a brief rally, O’Leary couldn’t overcome Chamberlain’s late surge.

Boxing royalty in attendance

The event drew notable names from boxing history, including Prince Naseem Hamed and Carl Frampton. Promoter Frank Warren also made an appearance, adding to the high-profile nature of the night. The atmosphere in the 3Arena was electric, with fans loudly supporting both men throughout the action-packed 10 rounds. Steve Collins, who walked O’Leary out, was just one of many big names in the crowd.

O’Leary, known for his aggressive and unorthodox style, pushed hard to find a way back into the fight, but Chamberlain’s power and experience proved too much. Despite his valiant efforts, the result was clear and marked the end of O’Leary’s reign as world champion.

Based on reporting by Bloody Elbow, compiled by the Tradingbird newsroom. Published 01 Aug 2026, 22:57.
Topics: Boxing · Multisport

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