Jack O'Brien boxer
- bouts
- 15
- won
- 6
- lost
- 7
- draw
- 2
- Status
- inactive
- Division
- middleweight
- Debut
- 1931-08-26
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- United Kingdom
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1935-11-04 | Frank Clements | LLLLLL | Arena, Belfast | DRAW Points |
| 1935-10-24 | Eddie Steele Martin | WWWW | Ulster Hall, Belfast | LOST Points |
| 1935-09-25 | Willie Duncan | LWWLLL | Arena, Belfast | WIN Technical knockout |
| 1935-03-16 | Bushman Dempster | WDLLWW | The Ring, Belfast | WIN Points |
| 1935-03-09 | Tommy Burns | WDLLLL | The Ring, Belfast | DRAW Points |
| 1935-01-30 | Darky Ellis | WWWWWD | Arcadia, Scarborough | LOST Points |
| 1935-01-21 | Tom Richwood | WDDWW | New St James Hall, Newcastle | LOST Points |
| 1934-12-17 | Charlie McDonald | LWLWLL | New St James Hall, Newcastle | LOST Points |
| 1933-12-31 | Johnny (Young) Summers | LLWWLL | Belfast | WIN Points |
| 1933-04-14 | George Gordon | WLLLWW | Belfast | WIN Corner retirement |
| 1932-11-07 | Glen Moody | WLWLWL | Windsor Hall, Bradford | LOST Points |
| 1932-02-22 | Fred Shaw | WLLDLL | Windsor Hall, Bradford | LOST Points |
| 1931-12-21 | Young Rea | debut | St Marys Hall, Belfast | WIN KO |
| 1931-10-06 | Jim Winters | WWWWWW | Music Hall, Edinburgh | LOST Points |
| 1931-08-26 | Alf Noble | LWLLWL | Winter Gardens, Morecambe | WIN Corner retirement |
