# Chamberlain knocks out O'Leary in Dublin upset

Chamberlain secured a surprising knockout victory over O'Leary in a fight held in Dublin. The upset win is significant for the fighters' careers and could shift rankings in their division.

**Importance:** 2/5

## Sources

### Sports
- [BBC Sport](https://www.bbc.co.uk/sport/boxing/articles/cd0xl447pr2o?at_medium=RSS&at_campaign=rss) — Sat, 01 Aug 2026 22:46:11 GMT