Pierce O'Leary Defends IBO Super‑Lightweight Title Against Mark Chamberlain in Dublin

On August 1, 2026 the IBO super‑lightweight world title was contested at Dublin’s 3Arena. Irish champion Pierce O'Leary defended the belt against England’s Mark Chamberlain in a bout that had been postponed from March after Chamberlain suffered a severe chest infection. The fight was broadcast live on the streaming service DAZN.

The main card also featured a vacant WBA continental super‑welterweight title bout between Ben Fail and Craig O'Brien, as well as other Irish‑focused match‑ups such as Royston Barney‑Smith vs Reece Bellotti and Gary Cully vs Lee Reeves. Former two‑weight world champion Steve Collins praised O'Leary’s rise and the overall health of Irish boxing, noting the event’s strong local support and the role of promoters in revitalising the sport in Dublin.

The event marked a significant moment for Irish boxing, drawing large crowds and extensive media coverage, while also highlighting Chamberlain’s comeback after his illness.