Jack O'Brien boxer
- bouts
- 9
- won
- 1
- lost
- 5
- draw
- 2
- Status
- inactive
- Division
- light heavyweight
- Debut
- 1891-05-16
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Australia
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1905-07-25 | Bill Smith | WWWLWL | NSC Athletic Hall, Sydney | LOST Technical knockout |
| 1905-04-01 | Bill Smith | LWWWWL | Gaiety Athletic Hall, Sydney | LOST KO |
| 1901-01-21 | Harry Dawson | WWWLW | Gaiety Athletic Club, Sydney | NC |
| 1899-06-05 | Ted Arthur | debut | Oddfellows' Hall, Wyalong | DRAW Points |
| 1899-05-31 | Otto Cribb | WWWW | Alhambra AC,Haymarket, Sydney | LOST KO |
| 1898-06-18 | Sandy Ross | LLWD | Golden Gate A.C., Sydney | DRAW Points |
| 1896-11-07 | Jack Goggins | L | Victoria Hall, Melbourne | LOST Corner retirement |
| 1893-04-01 | Bill Heffernan | LWWW | LOST KO |
|
| 1891-05-16 | Fred Preston | debut | Federal Rink, Albury | WIN KO |