Gus Koster boxer
- bouts
- 14
- won
- 9
- lost
- 5
- draw
- 0
- Status
- inactive
- Division
- heavyweight
- Debut
- 1898-09-02
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1905-04-06 | William Johnson | WWLL | Woodward's Pavilion, San Francisco | WIN Points |
| 1904-03-18 | Joe Stanley | debut | Woodward's Pavilion, San Francisco | WIN Points |
| 1904-02-05 | Walter Moreno | debut | Mechanic's Pavilion, San Francisco | LOST Points |
| 1903-07-15 | Jim Fox | debut | Mechanics' Pavilion Annex, San Francisco | WIN Points |
| 1903-03-20 | William Johnson | WW | Sixth Street Gym, San Francisco | WIN Points |
| 1903-02-20 | Frank Weaklin | LLWWWL | San Francisco A.C., San Francisco | WIN Points |
| 1902-10-29 | Frank Weaklin | L | Mechanics' Pavilion Annex, San Francisco | WIN Points |
| 1902-09-19 | Joe Long | WLLW | San Francisco A.C., San Francisco | LOST Points |
| 1902-08-14 | Joe Long | WLL | Woodward's Pavilion, San Francisco | LOST Points |
| 1898-09-02 | Patsy Corrigan | LLWL | Reliance A.C., Oakland | LOST Technical knockout |