Mark Chamberlain Defeats Pierce O'Leary to Win IBO Light-Welterweight Title

Mark Chamberlain achieved a significant victory over Pierce O'Leary in Dublin, knocking him out in the 10th round to win the IBO light-welterweight title. This match marked O'Leary's first professional defeat.

Chamberlain, who had previously lost to Josh Padley in 2024, faced a challenging fight as he was knocked down in the seventh round by a powerful body shot from O'Leary. However, he managed to recover and turned the tide in the later rounds.

After a cautious start, Chamberlain dropped O'Leary twice in the earlier rounds with strong punches, but O'Leary fought back, gaining momentum until the decisive 10th round, where Chamberlain landed a combination that sent O'Leary to the canvas.