PO
Super lightweight
Pierce O'Leary 19-1-0 11 KO · 2019–2026
Pierce O'Leary is a super lightweight boxer, born Feb 28, 2000. Record 19-1-0 with 11 knockouts over 2019–2026. Pierce O'Leary last fought Mark Chamberlain on Aug 1, 2026 and lost by TKO in round 10 of 12.
Born Feb 28, 2000
Country —
Stance Orthodox
Nickname Big Bang
Debut Oct 11, 2019
Career 2019–2026
Rounds boxed 114
KO share 58%
Titles IBO super-lightweight title 2026
Boxerbook rating #27 in Super lightweight · 1889 ± 143Why here › Confirmed bouts 2 of 20
Record and next fight Record
19-1-0, 11 KOs · 2019–2026
Next fight
No next fight confirmed
Last result L
For IBO super-lightweight title TKO 10/12 · 3Arena, Dublin, 🇮🇪
The record 20 bouts, 2019–2026, newest first. Records under each bout are both boxers going in.
L
For IBO super-lightweight title TKO 10/12 · 3Arena, Dublin, 🇮🇪
O'Leary 19-0-0 · Chamberlain 17-1-1
W
Won vacant IBO super-lightweight title RTD 5/12 · 3Arena, Dublin, 🇮🇪
O'Leary 18-0-0 · Hughes 29-8-2
W
Braian Esequiel Ronner
KO 8/8 · Rushcliffe Arena, Nottingham, 🇬🇧
O'Leary 17-0-0 · Ronner —
W
Won vacant European super-lightweight title UD 12/12 · Portman Road, Ipswich, 🇬🇧
O'Leary 16-0-0 · Dillon —
W
Jose Edgardo Perdomo
TKO 3/8 · Wembley Arena, London, 🇬🇧
O'Leary 15-0-0 · Perdomo —
W
Darragh Foley
Retained WBC International super-lightweight title UD 10/10 · SSE Arena, Belfast, 🇬🇧
O'Leary 14-0-0 · Foley —
W
Hovhannes Martirosyan
Retained WBC International super-lightweight title KO 9/10 · bp pulse LIVE, Birmingham, 🇬🇧
O'Leary 13-0-0 · Martirosyan —
W
Kane Gardner
Retained WBC International super-lightweight title UD 10/10 · Wembley Arena, London, 🇬🇧
O'Leary 12-0-0 · Gardner —
W
Alin Florin Ciorceri
Retained WBC International super-lightweight title TKO 1/10 · SSE Arena, Belfast, 🇬🇧
O'Leary 11-0-0 · Ciorceri —
W
Emmanuel Mungandjela
Won vacant WBC International super-lightweight title UD 10/10 · The O2 Arena, London, 🇬🇧
O'Leary 10-0-0 · Mungandjela —
W
Robin Zamora
TKO 2/8 · Copper Box Arena, London, 🇬🇧
O'Leary 9-0-0 · Zamora —
W
Nathan Augustine
KO 1/8 · York Hall, Bethnal Green, 🇬🇧
O'Leary 8-0-0 · Augustine —
W
Siar Ozgul
TKO 7/8 · York Hall, Bethnal Green, 🇬🇧
O'Leary 7-0-0 · Ozgul —
W
Jan Marsalek
TKO 2/4 · Bolton Whites Hotel (De Vere Whites), Bolton, 🇬🇧
O'Leary 6-0-0 · Marsalek —
W
Irvin Magno
PTS 6/6 · Bolton Whites Hotel (De Vere Whites), Bolton, 🇬🇧
O'Leary 5-0-0 · Magno —
W
Jacob Quinn
TKO 4/6 · Production Park Studios, South Kirkby, 🇬🇧
O'Leary 4-0-0 · Quinn —
W
Liam Richards
PTS 4/4 · Ulster Hall, Belfast, 🇬🇧
O'Leary 3-0-0 · Richards —
W
Alec Bazza
TKO 2/4 · Bolton Whites Hotel (De Vere Whites), Bolton, 🇬🇧
O'Leary 2-0-0 · Bazza —
W
Chris Adaway
PTS 4/4 · Emirates Arena, Glasgow, 🇬🇧
O'Leary 1-0-0 · Adaway —
W
Oscar Amador
PTS 4/4 · Ulster Hall, Belfast, 🇬🇧
O'Leary 0-0-0 · Amador —
Ratings now
World titles No world title reigns recorded.
Facts
What is Pierce O'Leary's record? Pierce O'Leary's professional record is 19-1-0 with 11 knockouts.
When is Pierce O'Leary's next fight? No next fight is confirmed as of 17 Oct 2026.
Who did Pierce O'Leary fight last? Pierce O'Leary last fought Mark Chamberlain on Aug 1, 2026 and lost by TKO in round 10 of 12. Promoter
Sources Boxerbook ID 3804 · permanent link boxerbook.com/id/3804 . Wikidata (CC0), English Wikipedia (CC BY-SA), publisher rankings. Last fetched: 2026-10-11. Spot a mistake? Every bout page has a link to report it.