Johnny O'Brien (Jimmy) boxer
- bouts
- 15
- won
- 10
- lost
- 5
- draw
- 0
- Status
- inactive
- Division
- welterweight
- Debut
- 1940-03-01
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1946-12-20 | Leon Thompson | LWWWWL | Chicago Stadium, Chicago | LOST Points |
| 1946-12-11 | Johnny McGrand | WWW | Auditorium, Saint Paul | LOST Unanimous decision |
| 1946-09-23 | Billy Bengal | LLWWWL | Marigold Gardens Outdoor Arena, Chicago | LOST Technical knockout |
| 1946-08-26 | Langford Green | WLWL | Marigold Gardens, Chicago | WIN Points |
| 1946-04-17 | Jack Beatty | WLWWL | Marigold Gardens, Chicago | WIN KO |
| 1946-03-11 | Tommy James | LWWDDW | Marigold Gardens, Chicago | WIN Technical knockout |
| 1946-02-15 | Buzz Brown | WWWLLL | Auditorium, Saint Paul | WIN Points |
| 1946-02-04 | Ted Newsome | LWLLLW | Marigold Gardens, Chicago | WIN Points |
| 1942-03-16 | Dan Lancaster | W | Marigold Gardens, Chicago | WIN Technical knockout |
| 1942-02-09 | Jimmy Williams | debut | Legion Coliseum, Sarasota | LOST KO |
| 1941-12-01 | Larry Russell | DDLLLL | Marigold Gardens, Chicago | WIN Points |
| 1941-11-24 | Al Capalby | LDLLWW | Marigold Gardens, Chicago | WIN Points |
| 1941-11-19 | Arnold Deer | WLDLL | Civic Center, Hammond | WIN Points |
| 1941-11-17 | Stanley Murczek | LDLW | Marigold Gardens, Chicago | WIN Points |
| 1940-03-01 | Ray Isaacs | WLDWLL | Armory, Minneapolis | LOST Technical knockout |