Jack Brennan (Jock) boxer
- bouts
- 5
- won
- 1
- lost
- 4
- draw
- 0
- Status
- inactive
- Division
- middleweight
- Debut
- 1938-11-28
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1939-01-30 | John Leonardi | debut | St. Nicholas Arena, New York | LOST KO |
| 1939-01-10 | Jack McCrosson | WWWWWW | Broadway Arena, Brooklyn | LOST KO |
| 1938-12-31 | Pete Muscarnera | debut | Ridgewood Grove, Brooklyn | LOST Points |
| 1938-12-17 | Meyer Zager | WWWW | Ridgewood Grove, Brooklyn | WIN Points |
| 1938-11-28 | Johnny Craig | W | St. Nicholas Arena, New York | LOST Points |