Young Jack O'Brien boxer
- bouts
- 27
- won
- 16
- lost
- 9
- draw
- 1
- Status
- inactive
- Division
- lightweight
- Debut
- 1900-11-30
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1907-12-13 | Jimmy Livingstone | LWDWWL | Industrial Hall, Philadelphia | LOST |
| 1907-12-02 | Benny Kaufman | DLLLWW | Spring Garden A.C., Philadelphia | WIN |
| 1907-10-07 | Eddie Ward | LL | Spring Garden A.C., Philadelphia | DRAW |
| 1907-06-28 | Rube Buckley | debut | Powelton A.C., Philadelphia | WIN KO |
| 1907-06-07 | Young Brady | LDW | Spring Garden A.C., Philadelphia | WIN KO |
| 1907-05-31 | Joe Baker | L | Powelton A.C., Philadelphia | WIN |
| 1907-05-29 | Kid Hay | debut | Spring Garden A.C., Philadelphia | WIN Technical knockout |
| 1907-02-22 | Young Ike Weir | LDLL | Wayne A.C., Philadelphia | WIN KO |
| 1906-02-10 | Abe Hollandersky | WLDDDD | Metropolitan A.C., New York | WIN Technical knockout |
| 1906-02-07 | Jimmy Earle | debut | National S.C., Wilmington | NC No Contest |
| 1906-01-26 | Jimmy Perry | debut | Kensington A.C., Philadelphia | WIN |
| 1906-01-12 | Eddie Welsh | WWWL | Kensington A.C., Philadelphia | WIN KO |
| 1905-12-25 | Jack Murphy | LWLDLW | National S.C., Wilmington | DRAW Points |
| 1905-11-03 | Young Flynn | LWDW | Richmond A.C., Philadelphia | LOST KO |
| 1905-02-08 | Young Griffo | WWLDDW | Wilmington A.C., Wilmington | LOST Points |
| 1905-02-01 | Young Griffo | WWWLDL | Wilmington A.C., Wilmington | WIN KO |
| 1905-01-30 | Young Griffo | WWWLDD | Chester | LOST |
| 1904-09-29 | Jack Dorner | WLDDW | Broadway A.C., Philadelphia | WIN Technical knockout |
| 1904-09-22 | Benny Thompson | DD | Broadway A.C., Philadelphia | LOST KO |
| 1904-06-30 | Jack Ryan | LDWLWL | Broadway A.C., Philadelphia | LOST KO |
| 1904-06-27 | Young Sloan | D | Broadway A.C., Chester | LOST |
| 1904-04-09 | Kid Fitzgerald | LWWLLL | Richmond A.C., Philadelphia | LOST KO |
| 1903-10-29 | Tommy Brady | WW | Broadway A.C., Philadelphia | DRAW |
| 1903-05-29 | Joe 'Buck' Kelly | LLLLWD | Ariel A.C., Philadelphia | WIN Technical knockout |
| 1903-05-25 | Young George Mack | LWWDWW | Broadway A.C., Chester | LOST KO |
| 1903-05-21 | Joe 'Buck' Kelly | LWLLLL | Broadway A.C., Philadelphia | LOST |
| 1903-05-14 | Joe Williams | DWLLDD | Broadway A.C., Philadelphia | WIN KO |
| 1902-06-30 | Billy Willis | LDWDW | Golden Gate A.C., Philadelphia | LOST KO |
| 1902-06-23 | Joe Riley | WWLWWW | Golden Gate A.C., Philadelphia | WIN Technical knockout |
| 1902-06-06 | Kid Foster | W | Frankford A.C., Philadelphia | WIN KO |
| 1902-04-29 | Harry Mack | debut | Golden Gate A.C., Philadelphia | WIN KO |
| 1902-04-10 | Young Leary | debut | Armory Hall, Chester | DRAW |
| 1902-04-07 | Jack Douglas | WLL | Quaker City Driving Assn., Philadelphia | WIN KO |
| 1902-04-03 | Johnny Devine | WWDWLD | Broadway A.C., Philadelphia | LOST Technical knockout |
| 1902-03-27 | Eddie Wallace | LL | Broadway A.C., Philadelphia | WIN Technical knockout |
| 1902-03-21 | Jack Corrigan | debut | Central A.C., Philadelphia | WIN |
| 1902-01-25 | Joe Williams | D | Keystone A.C., Philadelphia | LOST Technical knockout |
| 1900-11-30 | Billy Sims | debut | Manayunk A.C., Philadelphia | WIN KO |
