Cestus › Fighters › Philadelphia Jack O'Brien
147-16-24 (147 wins, 16 losses, 24 draws) · 55 KO · Boxing · Middleweight · USA
| Result | Opponent | Method | Round | Date |
|---|---|---|---|---|
| Loss | Ben Koch | NWS | 6 | Jun 17, 1910 |
| Loss | Harry Ramsey | NWS | 6 | Nov 27, 1910 |
| Loss | Sam Langford | TKO | 5/10 | Aug 15, 1911 |
| Win | Mike Schreck | NWS | 10 | May 2, 1910 |
| Loss | Al Kaufman | NWS | 6 | Apr 21, 1910 |
| Loss | Al Kaufman | NWS | 6 | Jan 19, 1910 |
| Win | Charley Stevenson | NWS | 6 | Nov 29, 1909 |
| Win | Fireman Jim Flynn | NWS | 6 | Jul 30, 1909 |
| Loss | Stanley Ketchel | TKO | 3/6 | Jun 9, 1909 |
| Draw | Jack Johnson | NWS | 6 | May 19, 1909 |
| Loss | Stanley Ketchel | NWS | 10 | Mar 26, 1909 |
| Win | Fred Cooley | PTS | 2 | Jan 4, 1909 |