Jack O'Brien boxer
- bouts
- 97
- won
- 49
- lost
- 37
- draw
- 11
- Status
- inactive
- Division
- lightweight
- Debut
- 1925-11-12
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1932-12-16 | Michigan Joe Gans | WWWWWW | Tulare A.C., Tulare | LOST Technical knockout |
| 1932-12-15 | Ray Kiser | WLDD | Pasadena Arena, Pasadena | DRAW Points |
| 1932-11-17 | Happy Romero | WWWLLL | Pasadena Arena, Pasadena | LOST Points |
| 1932-11-03 | Ray Kiser | debut | Pasadena Arena, Pasadena | LOST Points |
| 1932-10-20 | Happy Romero | LLWWWL | Pasadena Arena, Pasadena | WIN Points |
| 1932-10-17 | Buzz Atkins | LL | Culver City Arena, Culver City | WIN Points |
| 1932-10-06 | Danny Martin | WLLLW | Pasadena Arena, Pasadena | WIN KO |
| 1932-09-29 | Caddy Casey | WDLWWW | Pasadena Arena, Pasadena | WIN Points |
| 1932-08-25 | Elliott Padilla | WLL | Pasadena Arena, Pasadena | WIN Points |
| 1932-07-22 | Rainey McDonald | WDWWLW | Ventura A.C., Ventura | WIN KO |
| 1932-06-24 | Battling Teco | DDLWWW | Ventura A.C., Ventura | WIN Points |
| 1932-05-26 | Happy Romero | LDLLLL | Orange Belt A.C., San Bernardino | WIN Technical knockout |
| 1932-05-17 | Sammy Langford | debut | Olympic Auditorium, Los Angeles | LOST Points |
| 1932-05-09 | Deacon Leo Kelly | DWL | Culver City Stadium, Culver City | LOST Points |
| 1932-04-29 | Battling Teco | WLLDDD | Ventura A.C., Ventura | WIN Points |
| 1932-01-29 | Johnny 'Bandit' Romero | WDWWWW | Coliseum, San Diego | LOST Points |
| 1932-01-20 | Jesus Macias | LDWL | Wilmington Bowl, Wilmington | LOST Points |
| 1932-01-13 | Tommy Huffman | LWWLWW | Wilmington Bowl, Wilmington | WIN Points |
| 1931-12-21 | Leo Hernandez | DLWWWW | Culver City Stadium, Culver City | WIN Points |
| 1931-12-07 | Don Conn | WWLLDL | Culver City Stadium, Culver City | WIN Technical knockout |
| 1931-11-16 | Sammy Aguirre | LLLWLL | Culver City Stadium, Culver City | WIN Points |
| 1931-11-02 | Kenneth Kent | DWLWWW | Culver City Stadium, Culver City | LOST Points |
| 1931-10-05 | Billy Dugan | DDL | Culver City Stadium, Culver City | WIN Points |
| 1931-08-31 | Cecil Jordan | DLWLDW | Culver City Stadium, Culver City | WIN Points |
| 1931-08-17 | Chuck Warden | debut | Culver City Stadium, Culver City | WIN Points |
| 1931-08-01 | Happy Romero | WLLWDW | Main Street Athletic Club, Los Angeles | LOST Points |
| 1931-05-09 | Indian Jimmy Rivers | LLDWLW | Main Street Athletic Club, Los Angeles | LOST Points |
| 1931-04-22 | Jackie Stewart | LLLWLL | Ocean Park Arena, Santa Monica | WIN Technical knockout |
| 1931-04-16 | Cecil Jordan | LDLWLD | Pasadena Arena, Pasadena | WIN Points |
| 1931-04-04 | Felipe Franco | debut | Main Street Athletic Club, Los Angeles | WIN KO |
| 1931-03-28 | Paulino Adlon | L | Main Street Athletic Club, Los Angeles | WIN KO |
| 1931-03-14 | Ace Spades | debut | Main Street Athletic Club, Los Angeles | WIN Points |
| 1931-02-14 | Bert Sampson | WWWWDW | Main Street Athletic Club, Los Angeles | LOST Points |
| 1929-05-03 | Julian Arriola | LWDLWL | Coliseum, San Diego | LOST |
| 1929-03-26 | Young Aurelio Herrera | WWWWWW | Bakersfield Arena, Bakersfield | LOST Points |
| 1929-02-22 | Young Sam Langford | LWLWDW | Bakersfield Arena, Bakersfield | LOST Points |
| 1928-12-12 | Sammy Jackson | WWWWLW | Ocean Park Arena, Santa Monica | LOST Points |
| 1928-11-23 | Joe Fernandez | WDWWWL | Bakersfield Arena, Bakersfield | WIN Technical knockout |
| 1928-11-06 | Jack McKnight | WWWL | Olympic Auditorium, Los Angeles | LOST Points |
| 1928-10-26 | Joe Fernandez | WWDWWW | Bakersfield Arena, Bakersfield | WIN Points |
| 1928-10-12 | Henry Carrillo | WDDWWD | Bakersfield Arena, Bakersfield | WIN KO |
| 1928-09-28 | Jess Hobson | WWWLWW | Legion Stadium, Hollywood | LOST Points |
| 1928-07-27 | Earl Farmer | LWWLDL | Legion Stadium, Hollywood | WIN Technical knockout |
| 1928-07-11 | Chris Martinez | LWLDWL | Ocean Park Arena, Santa Monica | LOST KO |
| 1928-06-20 | Frank Fuente | WWL | Ocean Park Arena, Santa Monica | DRAW Points |
| 1928-06-15 | Earl Farmer | LLWWL | Legion Stadium, Hollywood | DRAW Points |
| 1928-06-08 | Manuel Vasquez | WLWDWW | Legion Stadium, Hollywood | LOST Points |
| 1928-05-29 | Tommy Rios | DDLDLW | Wilmington Bowl, Wilmington | WIN Points |
| 1928-04-27 | Johnny Sprout Woods | WLDLDD | Bakersfield Arena, Bakersfield | LOST Points |
| 1928-02-24 | Phil Coykendall | WWWD | Legion Stadium, Hollywood | WIN Points |
| 1928-02-22 | Charlie Cobb | DLWLWL | Ocean Park Arena, Santa Monica | LOST Points |
| 1928-02-07 | Tony Tovar | LWWLLL | Olympic Auditorium, Los Angeles | WIN Points |
| 1928-01-24 | Frank Goosby | WLWWDW | Bakersfield Arena, Bakersfield | LOST Technical knockout |
| 1928-01-10 | Frank Goosby | WWLWWD | Bakersfield Arena, Bakersfield | LOST Points |
| 1927-12-27 | Frank Goosby | LWWLWW | Bakersfield Arena, Bakersfield | DRAW Points |
| 1927-12-22 | Manuel Vasquez | LLWWLW | Culver City | LOST Points |
| 1927-12-21 | Jimmy Valenti | DWWLW | Ocean Park Arena, Santa Monica | WIN Points |
| 1927-11-18 | Manuel Vasquez | LLLWWL | Lompoc | LOST Points |
| 1927-09-29 | Joe Bailey | WLLWDL | Pasadena | LOST Points |
| 1927-08-10 | Young Firpo | DLLDLW | Ocean Park Arena, Santa Monica | LOST Points |
| 1927-06-16 | Phil Blood | LLWLWL | Pasadena | WIN Points |
| 1927-05-05 | Joe Bailey | WWLLWD | Pasadena | WIN Points |
| 1927-04-21 | Joe Bailey | DWWLLW | Armory, Pasadena | DRAW Points |
| 1927-03-02 | Frankie Forbes | WDLWLL | Wilmington Bowl, Wilmington | WIN Points |
| 1927-02-25 | Kid Kopecks | WWLLLL | Bakersfield Arena, Bakersfield | WIN Points |
| 1927-02-16 | Ted Lewin | debut | Ocean Park Arena, Santa Monica | LOST Points |
| 1927-01-26 | Chepney Miller | WWWLLW | Wilmington Bowl, Wilmington | WIN Points |
| 1927-01-14 | Jackie Johnson | DDLLLL | Legion Stadium, Hollywood | WIN Points |
| 1926-12-30 | William Billy Coe | WLLL | Culver City Stadium, Culver City | LOST Points |
| 1926-12-02 | Jimmy Schwartz | WWLLL | Pasadena | DRAW Points |
| 1926-11-30 | Joe Fernandez | WWLDWD | Bakersfield | WIN Points |
| 1926-11-18 | Jimmy Schwartz | WWL | Pasadena | WIN Points |
| 1926-10-23 | Charley Roberts | LL | Main Street Athletic Club, Los Angeles | LOST |
| 1926-10-19 | Clyde Blalock | WWWLWW | Bakersfield Arena, Bakersfield | LOST Technical knockout |
| 1926-10-05 | Joey Coffman | WDDDLD | Scandinavian Hall, Klamath Falls | LOST KO |
| 1926-09-30 | Charley Roberts | debut | Armory, Pasadena | WIN Technical knockout |
| 1926-09-25 | Frankie Forbes | LW | Main Street Athletic Club, Los Angeles | DRAW Points |
| 1926-09-02 | Frankie Forbes | debut | Pasadena | WIN Points |
| 1926-08-17 | Bud Thomas | DWLWLW | Scandinavian Hall, Klamath Falls | LOST Points |
| 1926-08-12 | Joe Cortez | LLWLLD | Pasadena | LOST Points |
| 1926-08-07 | Manuel Tujuerer | debut | Main Street Athletic Club, Los Angeles | WIN Points |
| 1926-07-06 | Chuck Borden | WWLWWL | Culver City | WIN Points |
| 1926-06-22 | Joe Arciniega | D | Culver City | DRAW Points |
| 1926-06-04 | Joe McKenzie | LLWWWL | Legion Stadium, Hollywood | LOST Points |
| 1926-06-02 | George Lavoie | LWLLWL | El Rio | DRAW Points |
| 1926-05-20 | Manuel Quintero | WWD | Armory, Pasadena | WIN Points |
| 1926-05-13 | Manuel Quintero | WW | California A.C., San Bernardino | DRAW Points |
| 1926-04-15 | Ralph Hernandez | debut | Pasadena | WIN Points |
| 1926-04-08 | Jack Kent | debut | Pasadena | WIN KO |
| 1926-04-06 | Charlie Dunn | DL | Culver City | WIN KO |
| 1926-03-23 | Joe Cortez | WWWLL | Culver City | LOST KO |
| 1926-03-09 | Sailor Joe Reaume | WLWWWL | Culver City | WIN Points |
| 1926-02-04 | Art Williams | debut | Pasadena | DRAW Points |
| 1926-01-28 | Charley Peters | debut | Pasadena | LOST Points |
| 1925-12-17 | Ed Jones | debut | Pasadena | WIN KO |
| 1925-11-12 | Frank Popinvich | debut | Armory, Pasadena | WIN Points |
