Sylvester O'Brien boxer
- bouts
- 0
- won
- 0
- lost
- 0
- draw
- 0
- Status
- inactive
- Division
- featherweight
- Debut
- 1926-11-15
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1928-05-14 | Frankie Gierke | debut | Pennsylvania Gym, Indianapolis | WIN |
| 1927-02-14 | Howard Jones | L | Broadway Arena, Louisville | WIN |
| 1926-11-22 | Bill Parrott | DWLWWL | Broadway Arena, Louisville | WIN |
| 1926-11-15 | Joe Kuhn | LWL | Jefferson County Armory, Louisville | LOST |