Pierce O'Leary (boxer)

Pierce O'Leary
Personal information
NicknameBig Bang[1]
NationalityIrish
Born (2000-02-28) 28 February 2000[1]
Height5 ft 8 in (173 cm)[1]
WeightSuper-lightweight
Boxing career
StanceOrthodox
Boxing record[2]
Total fights20
Wins19
Win by KO11
Losses1

Pierce O'Leary (born 28 February 2000) is an Irish professional boxer He held the IBO super-lightweight title in 2026. O'Leary is also a former European champion in the same weight division.

Career

A nine-time Irish amateur champion, O'Leary turned professional in 2019, signing a promotional contract with MTK Global.[3] He made his pro-debut on 11 October that year, defeating Oscar Amador on points over four rounds at Ulster Hall in Belfast.[4]

Unbeaten in his first 10 professional fights and now signed to Frank Warren's Queensbury Promotions, O'Leary claimed the vacant WBC International super-lightweight title thanks to a unanimous decision win over Emmanuel Mungandjela at the O2 Arena in London on 26 November 2022.[5][6]

He made the first defense of his championship at the SSE Arena in Belfast on 27 May 2023, stopping Alin Florin Ciorceri in the first round.[7]

On 23 September 2023, he retained his title with a unanimous decision victory over Kane Gardner at Wembley Arena in London.[8][9]

Two more successful defenses followed as O'Leary stopped Hovhannes Martirosyan in the ninth round at Resorts World Arena in Birmingham on 16 March 2024,[10][11] and then prevailed via unanimous decision against Darragh Foley back at the SSE Arena in Belfast on 28 June 2024.[12][13]

In his next outing, he stopped Jose Edgardo Perdomo in the third of their scheduled eight-round non-title contest at Wembley Arena in London on 7 December 2024.[14][15]

O'Leary defended his championship for the fifth time against Liam Dillon at Portman Road in Ipswich on 7 June 2025, with the vacant European super-lightweight title also on the line.[16][17] He won via unanimous decision.[18][19]

He was scheduled to face Mark Chamberlain for the vacant IBO super-lightweight title at 3Arena in Dublin on 14 March 2026.[20] However, Chamberlain withdrew two weeks before the fight was due to take place due to illness and was replaced by Maxi Hughes.[21] O'Leary won when Hughes retired on his stool at the end of the fifth round.[22][23] The fight between O'Leary and Chamberlain was then rescheduled to take place at 3Arena in Dublin on 1 August 2026.[24][25] O'Leary was sent to the canvas in the second and third rounds before scoring a knock down of his own in the seventh. He was floored again in the 10th round with the referee stepping in to stop the contest and award Chamberlain the win via technical knockout.[26][27]

Professional boxing record

20 fights 19 wins 1 loss
By knockout 11 1
By decision 8 0
No. Result Record Opponent Type Round, time Date Location Notes
20 Loss 19–1 Mark Chamberlain TKO 10 (12), 1:37 1 Aug 2026 3Arena, Dublin, Ireland Lost IBO super-lightweight title
19 Win 19–0 Maxi Hughes RTD 5 (12), 3:00 14 Mar 2026 3Arena, Dublin, Ireland Won vacant IBO super-lightweight title
18 Win 18–0 Braian Esequiel Ronner KO 8 (8), 0:53 6 Dec 2025 Rushcliffe Arena, Nottingham, Nottinghamshire, England
17 Win 17–0 Liam Dillon UD 12 7 Jun 2025 Portman Road, Ipswich, Suffolk, England Won vacant European super-lightweight title
16 Win 16–0 Jose Edgardo Perdomo TKO 3 (8), 1:06 7 Dec 2024 Wembley Arena, London, England
15 Win 15–0 Darragh Foley UD 10 28 Jun 2024 SSE Arena, Belfast, Northern Ireland Retained WBC International super-lightweight title
14 Win 14–0 Hovhannes Martirosyan KO 9 (10), 2:39 16 Mar 2024 bp pulse LIVE, Birmingham, West Midlands, England Retained WBC International super-lightweight title
13 Win 13–0 Kane Gardner UD 10 23 Sep 2023 Wembley Arena, London, England Retained WBC International super-lightweight title
12 Win 12–0 Alin Florin Ciorceri TKO 1 (10), 2:39 27 May 2023 SSE Arena, Belfast, Northern Ireland Retained WBC International super-lightweight title
11 Win 11–0 Emmanuel Mungandjela UD 10 26 Nov 2022 The O2 Arena, London, England Won vacant WBC International super-lightweight title
10 Win 10–0 Robin Zamora TKO 2 (8), 1:01 16 Jul 2022 Copper Box Arena, London, England
9 Win 9–0 Nathan Augustine KO 1 (8), 2:41 15 Apr 2022 York Hall, Bethnal Green, London, England
8 Win 8–0 Siar Ozgul TKO 7 (8), 1:14 29 Oct 2021 York Hall, Bethnal Green, London, England
7 Win 7–0 Jan Marsalek TKO 2 (4), 2:30 25 Jun 2021 Bolton Whites Hotel (De Vere Whites), Bolton, Lancashire, England
6 Win 6–0 Irvin Magno PTS 6 19 Feb 2021 Bolton Whites Hotel (De Vere Whites), Bolton, Lancashire, England
5 Win 5–0 Jacob Quinn TKO 4 (6), 0:21 12 Aug 2020 Production Park Studios, South Kirkby, Yorkshire, England
4 Win 4–0 Liam Richards PTS 4 1 Feb 2020 Ulster Hall, Belfast, Northern Ireland
3 Win 3–0 Alec Bazza TKO 2 (4), 1:56 20 Dec 2019 Bolton Whites Hotel (De Vere Whites), Bolton, Lancashire, England
2 Win 2–0 Chris Adaway PTS 4 16 Nov 2019 Emirates Arena, Glasgow, Scotland
1 Win 1–0 Oscar Amador PTS 4 11 Oct 2019 Ulster Hall, Belfast, Northern Ireland

References

  1. 1 2 3 "Pierce O'Leary". tapology.com. Retrieved 21 May 2025.
  2. ↑ "Boxing record for Pierce O'Leary". BoxRec.
  3. ↑ "MTK Global Sign All-Conquering Amateur O'Leary". Fight Post. Retrieved 21 May 2025.
  4. ↑ "'Everyone knows who I am now' – Dublin prospect Pierce O'Leary reacts to 'special' debut". Irish Boxing. Retrieved 21 May 2025.
  5. ↑ "Boxing: Dublin 22-year-old on path to gold". Dublin Gazette. Retrieved 21 May 2025.
  6. ↑ "Pierce O'Leary Dominates Mungandjela Over Ten Rounds; Tommy Fletcher Delivers Highlight Reel KO". Boxing Scene. Retrieved 21 May 2025.
  7. ↑ "Pierce O'Leary records impressive first round victory on Michael Conlan v Luis Alberto Lopez undercard". Irish Mirror. Retrieved 21 May 2025.
  8. ↑ "Irish Pride Prevails in Wembley: Pierce O'Leary Defends WBC International Super Lightweight Belt". wbcboxing.com. Retrieved 21 May 2025.
  9. ↑ "Pierce O'Leary Fights Kane Gardner To Unanimous Decision Win". Boxing Scene. Retrieved 21 May 2025.
  10. ↑ "BIG BANG – Pierce O'Leary scores another big KO". Irish Boxing. Retrieved 21 May 2025.
  11. ↑ "Magnificent Seven Results: Pierce O'Leary vs Hovhannes Martirosyan". ringside24.com. Retrieved 21 May 2025.
  12. ↑ "Pierce O'Leary retains WBC International belt, Conner Kelsall claims vacant Commonwealth flyweight title". TNT Sports. Retrieved 21 May 2025.
  13. ↑ "Pierce O'Leary Outscores Determined Darragh Foley". Boxing Scene. Retrieved 21 May 2025.
  14. ↑ "Pierce O'Leary lands knockout with perfectly timed left hook to set up big fights in 2025". Irish Mirror. Retrieved 21 May 2025.
  15. ↑ "'Shark' Pierce O'Leary nearing world's best at 140lbs". Boxing Scene. Retrieved 21 May 2025.
  16. ↑ "Pierce O'Leary set to face Liam Dillon for vacant European title". Boxing News Online. Retrieved 21 May 2025.
  17. ↑ "Pierce O'Leary, Liam Dillon To Contest Vacant European Junior Welterweight Title On June 7". The Ring. Retrieved 21 May 2025.
  18. ↑ "Pierce O'Leary outpoints Liam Dillon for European title". Boxing News Online. Retrieved 7 June 2025.
  19. ↑ "Pierce O'Leary Outlasts Resilient Liam Dillon To Claim Vacant European Junior Welterweight Title". The Ring. Retrieved 7 June 2025.
  20. ↑ "Pierce O'Leary is Coming Home – Dublin Date for Big Bang". Irish Boxing. Retrieved 26 January 2026.
  21. ↑ "Pierce O'Leary set for Maxi Hughes test after Mark Chamberlain illness". DAZN. Retrieved 2 March 2026.
  22. ↑ "Pierce O'Leary Stops Maxi Hughes After Five Rounds To Win IBO Title In Dublin". Boxing News 24/7. Retrieved 14 March 2026.
  23. ↑ "Pierce O'Leary stops courageous veteran Maxi Hughes in Dublin". Boxing Scene. Retrieved 14 March 2026.
  24. ↑ "Pierce O'Leary set to headline Dublin card against Mark Chamberlain". RTE.
  25. ↑ "Pierce O'Leary vs. Mark Chamberlain rescheduled for August 1 in Dublin". boxingscene.com.
  26. ↑ "Pierce O'Leary brutally knocked out by Mark Chamberlain in front of boxing royalty at Dublin's 3Arena". bloodyelbow.com. Retrieved 1 August 2026.
  27. ↑ "Mark Chamberlain stuns Pierce O'Leary to win fight-of-the-year contender in 10th round". Boxing Scene. Retrieved 1 August 2026.
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