Jack O'Brien boxer
- bouts
- 24
- won
- 5
- lost
- 18
- draw
- 1
- Status
- inactive
- Division
- middleweight
- Debut
- 1932-06-25
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1934-10-15 | Tony Mandell | WWLLWW | Marigold Gardens, Chicago | LOST Points |
| 1933-11-27 | Tommy Habel | LDLWLW | White City Arena, Chicago | LOST Points |
| 1933-11-17 | Johnny Liston | WWWWDW | Rainbo Fronton, Chicago | LOST Points |
| 1933-11-10 | Hank Bueker | WLL | Rainbo Fronton, Chicago | LOST Points |
| 1933-09-22 | Johnny Liston | WWWW | Rainbo Fronton, Chicago | LOST Points |
| 1933-09-18 | Johnny Liston | WWW | White City Arena, Chicago | LOST Points |
| 1933-09-08 | Freddie Mitchell | WLWWLL | Rainbo Fronton, Chicago | WIN |
| 1933-07-14 | Chuck Reed | LWL | Rainbo Fronton, Chicago | LOST Points |
| 1933-07-07 | Jerry Kucera | LLLLWL | Rainbo Fronton, Chicago | LOST Points |
| 1933-06-30 | Eddie Chinski | WDLWLW | Rainbo Fronton, Chicago | LOST Points |
| 1933-06-23 | Chuck Reed | LW | Rainbo Fronton, Chicago | WIN Points |
| 1933-06-15 | Eddie Steigal | WWLW | Shewbridge Field, Chicago | LOST KO |
| 1933-05-23 | Larry Dayton | LLLLLL | Coulon's Gym, Chicago | LOST Points |
| 1933-05-16 | Curtis Mills | DLW | Coulon's Gym, Chicago | LOST Points |
| 1933-03-24 | Pee Wee Jarrell | WDLWWD | Anderson | LOST Points |
| 1933-02-14 | Laddie Tonielli | WWWWW | Midway Arena, Chicago | LOST Technical knockout |
| 1933-01-24 | Jerry Kucera | LLLLLL | Midway Gardens, Chicago | WIN Points |
| 1933-01-16 | Laddie Tonielli | WW | Midway Gardens, Chicago | LOST KO |
| 1933-01-10 | Jerry Kucera | LLLLLL | Midway Gardens, Chicago | WIN Points |
| 1932-12-20 | Jackie Parker | WWWWWW | Midway Arena, Chicago | LOST Points |
| 1932-11-29 | Wilfred Hoenselaar | L | Midway Arena, Chicago | WIN Points |
| 1932-11-15 | Steve Zeno | L | Midway Arena, Chicago | LOST Points |
| 1932-10-25 | Bobby Vernon | DWLLL | Midway Arena, Chicago | DRAW Points |
| 1932-06-25 | Pat Flaherty | WWLLDW | Savannah | LOST Points |
