Philadelphia Jack O'Brien boxer
- bouts
- 116
- won
- 92
- lost
- 6
- draw
- 14
- Status
- inactive
- Division
- light heavyweight
- Debut
- 1896-12-14
- Height
- 5′ 10½″/179cm
- Reach
- -
- Age
- 64
- Born
- 1878-01-17
- Death
- 1942-11-12
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1912-06-17 | Ben Koch | WWD | American A.C., Philadelphia | LOST |
| 1911-11-27 | Harry Ramsey | WLLWLD | American A.C., Philadelphia | LOST |
| 1911-08-15 | Sam Langford | WDWWWW | Twentieth Century A.C., New York | LOST Technical knockout |
| 1910-05-02 | Mike Schreck | WWDDLW | Lexington Opera House, Lexington | WIN |
| 1910-04-21 | Al Kaufman | WWWWLW | Duquesne Gardens, Pittsburgh | LOST |
| 1910-01-19 | Al Kaufman | WWWWWL | National A.C., Philadelphia | LOST |
| 1909-11-29 | Charley Stevenson | WWDLWW | West End A.C., Philadelphia | WIN |
| 1909-07-30 | Fireman Jim Flynn | LWLWLD | City Auditorium, Denver | WIN |
| 1909-06-09 | Stanley Ketchel | WLWWWW | National A.C., Philadelphia | LOST Technical knockout |
| 1909-05-19 | Jack Johnson | WWWWWW | National A.C., Philadelphia | DRAW |
| 1909-03-26 | Stanley Ketchel | WWWWLW | National A.C., New York | LOST |
| 1909-01-04 | Fred Cooley | LWLWWL | West End A.C., Philadelphia | WIN Points |
| 1908-11-09 | George Cole | DLLWWD | West End A.C., Philadelphia | WIN |
| 1908-09-25 | Tom Lenihan | LLWLWL | Ontario A.C., Philadelphia | WIN Technical knockout |
| 1908-09-07 | Larry Temple | DLLLL | West End A.C., Philadelphia | WIN |
| 1908-08-29 | Jack Rush | debut | Clarksburg | WIN KO |
| 1908-06-10 | Jack Blackburn | WWWDWW | National A.C., Philadelphia | WIN |
| 1908-03-02 | Jack Bonner | DWDWL | West End A.C., Philadelphia | WIN |
| 1908-02-11 | Bob Ward | WWWW | Charleston | DRAW Points |
| 1907-12-13 | Bill Heveron | WWWLWW | Industrial Hall, Philadelphia | WIN KO |
| 1907-05-08 | Tommy Burns | LWWWWD | Naud Junction Pavilion, Los Angeles | LOST Points |
| 1907-02-22 | Abdul 'The Turk' Malgan | WWWDLW | Naud Junction Pavilion, Los Angeles | WIN |
| 1906-11-28 | Tommy Burns | WLWWWW | Naud Junction Pavilion, Los Angeles | DRAW Points |
| 1906-10-16 | Fred Cooley | WWLDL | Naud Junction Pavilion, Los Angeles | WIN KO |
| 1906-08-20 | Ted Beecham | debut | New Castle | WIN KO |
| 1906-07-16 | Sam Berger | WLDWWW | National A.C., Philadelphia | DRAW |
| 1905-12-20 | Bob Fitzsimmons | WWWWWW | Mechanic's Pavilion, San Francisco | WIN Corner retirement |
| 1905-10-27 | Al Kaufman | WWWWW | Woodward's Pavilion, San Francisco | WIN KO |
| 1905-09-09 | Bill Bates | LLL | Fairbanks | WIN |
| 1905-08-31 | Bill Bates | LL | Dawson City | WIN Points |
| 1905-07-04 | Jack Twin Sullivan | WLWDWW | Dawson City | DRAW Points |
| 1905-04-25 | Hugo Kelly | WDWLDW | Auditorium, Indianapolis | LOST Points |
| 1905-04-07 | Young Peter Jackson | WWWWDL | 4th Regiment Armory, Baltimore | WIN Points |
| 1905-03-24 | Young Peter Jackson | WWWWWD | 4th Regiment Armory, Baltimore | WIN |
| 1905-02-01 | John Wille | DDWDLL | National A.C., Philadelphia | WIN |
| 1904-12-19 | Morris Harris | LWWWWW | Washington S.C., Philadelphia | WIN |
| 1904-12-10 | Larry Temple | LWDWLD | National A.C., Philadelphia | WIN |
| 1904-11-18 | Black Bill | WWLWDW | Manhattan A.C., Philadelphia | WIN |
| 1904-11-12 | Dixie Kid | WWWWLD | National A.C., Philadelphia | WIN |
| 1904-11-09 | John Wille | LWDDWD | National A.C., Philadelphia | WIN |
| 1904-10-21 | Jim Jeffords | WWLWLL | Eureka A.C., Baltimore | WIN KO |
| 1904-10-07 | Tommy Burns | DWWWWD | Panorama Building, Milwaukee | WIN |
| 1904-09-29 | Joe Butler | WLLWLL | Broadway A.C., Philadelphia | WIN KO |
| 1904-09-23 | Billy Stift | DDDLWD | Germania Maennerchor Hall, Baltimore | WIN KO |
| 1904-09-13 | Hugo Kelly | LWLWDW | National A.C., Philadelphia | WIN |
| 1904-07-23 | Bob Fitzsimmons | LWWWWW | Baker Bowl, Philadelphia | LOST |
| 1904-05-25 | George Cole | DDDWWW | National A.C., Philadelphia | WIN |
| 1904-05-14 | Charles Kid McCoy | WWLWLW | 2nd Regiment Armory, Philadelphia | DRAW |
| 1904-04-26 | Kid Carter | LLLWLL | Webster | WIN Technical knockout |
| 1904-04-14 | Jack Twin Sullivan | LLDLWW | West End Club, Saint Louis | WIN KO |
| 1904-03-18 | Hugo Kelly | WWLWDW | Battery D Armory, Chicago | WIN Points |
| 1904-03-10 | Mike Schreck | LWDWDD | West End A.C., Saint Louis | WIN Points |
| 1904-02-22 | Charles Mack | DDLWWL | Watita Hall, Chicago | WIN Technical knockout |
| 1904-01-27 | Tommy Ryan | WWWWWW | National A.C., Philadelphia | DRAW |
| 1903-12-29 | Hugo Kelly | DWWWLW | Vineyard's Hall, Kansas City | DRAW Points |
| 1903-12-24 | Jim Jeffords | LWWLLW | Broadway A.C., Philadelphia | WIN |
| 1903-12-22 | Jack Twin Sullivan | DWWWDL | Criterion A.C., Boston | WIN Points |
| 1903-12-18 | Diamond Dick Torpey | D | Chicago A.A., Chicago | WIN Points |
| 1903-12-12 | Mike Schreck | DWWWWL | Chicago A.A., Chicago | WIN Points |
| 1903-12-05 | Jack Williams | WLLWLD | National A.C., Philadelphia | WIN KO |
| 1903-11-18 | Jack Twin Sullivan | DDWWWD | National A.C., Philadelphia | WIN |
| 1903-10-26 | Bill Heveron | DWDLDW | Ginnetts Circus, Newcastle | WIN KO |
| 1903-10-12 | Jack Mullen | WWLWWL | Ginnetts Circus, Newcastle | WIN Corner retirement |
| 1903-09-21 | Charlie Haghey | LWWWWW | Ginnetts Circus, Newcastle | WIN KO |
| 1903-07-21 | Paddy Sheehan | DWWLLL | Bethlehem | WIN |
| 1903-07-11 | Jim Jeffords | LLWLWW | Southern A.C., Philadelphia | WIN |
| 1903-07-01 | Kid Carter | WLWLWW | Industrial Hall, Philadelphia | WIN |
| 1903-06-24 | Jack Bonner | DLWLDL | Mauch Chunk | WIN |
| 1903-05-26 | Jack Williams | WWWLDW | Southern A.C., Philadelphia | WIN |
| 1903-05-23 | George Byers | DDWDDL | National A.C., Philadelphia | WIN |
| 1903-05-14 | George Feeley | D | Broadway A.C., Philadelphia | WIN KO |
| 1903-05-05 | Marvin Hart | WWDLLW | Penn Art Club, Philadelphia | LOST |
| 1903-04-20 | Joe Walcott | LWWWDW | Health & Physical Culture A.C., Boston | DRAW Points |
| 1903-03-30 | Joe Choynski | WLWLWW | Washington S.C., Philadelphia | WIN |
| 1903-03-19 | Billy Payne | LLLWW | Broadway A.C., Philadelphia | WIN Technical knockout |
| 1903-03-09 | Jim Jeffords | WDWLLW | Masonic Hall, Pittsburgh | WIN Points |
| 1903-03-05 | Jack Butler | LLLLLL | Lancaster | WIN |
| 1903-02-26 | Al Weinig | LLLWLL | Broadway A.C., Philadelphia | WIN Technical knockout |
| 1903-01-08 | Joe Grim | DLWWWL | Broadway A.C., Philadelphia | WIN |
| 1903-01-01 | Al Weinig | DLLLLL | International A.C., Fort Erie | WIN KO |
| 1902-12-18 | Jimmy Watts | LLWWLL | Broadway A.C., Philadelphia | WIN KO |
| 1902-12-15 | Charlie McKeever | LWLLLD | Washington S.C., Philadelphia | WIN |
| 1902-11-19 | Marvin Hart | WWWWDL | Penn Art Club, Philadelphia | WIN |
| 1902-10-30 | Peter Maher | WLWWL | Penn Art Club, Philadelphia | WIN |
| 1902-10-23 | Jim Jeffords | WLWDWL | Broadway A.C., Philadelphia | WIN |
| 1902-10-03 | Peter Maher | LWLWW | Ariel A.C., Philadelphia | WIN |
| 1902-09-29 | Joe Choynski | WWWWLW | America A.C., Chicago | WIN Points |
| 1902-09-12 | Billy Stift | LDDWLW | Apollo Hall, Chicago | WIN Points |
| 1902-07-29 | Jack Lewis | LDWLWL | Mount Clemens | WIN KO |
| 1902-06-30 | Jim Driscoll | WWDWDD | America A.C., Chicago | WIN Points |
| 1902-06-20 | Yank Kenny | LLLLLL | Globe Theater, Philadelphia | WIN KO |
| 1902-06-16 | Jack Bonner | DLDWL | Paterson | DRAW |
| 1902-06-12 | George Cole | WDLWWW | Broadway A.C., Philadelphia | WIN |
| 1902-06-06 | Al Neill | WWWDWW | Wabash A.C., Chicago | WIN KO |
| 1902-06-02 | Charlie McKeever | DLLWLL | Industrial Hall, Philadelphia | WIN KO |
| 1902-05-23 | Jack Bonner | WDLDW | Golden Gate A.C., Philadelphia | WIN |
| 1902-05-10 | Tom Lenihan | LLLW | Central A.C., Philadelphia | WIN Technical knockout |
| 1902-05-03 | George Cole | WWWLWD | National A.C., Philadelphia | WIN Technical knockout |
| 1902-04-28 | Young Peter Jackson | WDWLWW | Washington S.C., Philadelphia | WIN |
| 1902-04-11 | Joe Walcott | WWWDWD | Industrial A.C., Philadelphia | WIN |
| 1902-04-01 | Charlie McKeever | LDLLW | Industrial Hall, Philadelphia | WIN |
| 1902-03-26 | Jack McCann | DDLD | Bijou Theater, Reading | WIN KO |
| 1902-03-20 | Rufus Graham | DWLDLL | Broadway A.C., Philadelphia | WIN |
| 1902-03-19 | Ed Denfass | DWWDWW | Penn Art Club, Philadelphia | WIN Technical knockout |
| 1902-03-10 | Charlie McKeever | LLLDL | Washington A.C., Philadelphia | WIN |
| 1902-03-03 | Andy Walsh | LWDLWD | Penn Art Club, Philadelphia | WIN Technical knockout |
| 1902-02-01 | Yank Kenny | LWLLLL | The Circus, West Hartlepool | WIN |
| 1902-01-27 | Charlie McKeever | LLLLD | Leeds and County Athletic Club, Leeds | WIN |
| 1902-01-20 | Pat McDonald | debut | Gymnasium,Charing Cross, Glasgow | WIN Technical knockout |
| 1901-12-12 | Yank Kenny | LLWLLL | Adelphi Theatre, Liverpool | WIN Technical knockout |
| 1901-11-18 | Frank Craig | WLLLLL | National Sporting Club, Covent Garden | WIN |
| 1901-11-07 | Jack Scales | WWWLLW | Liverpool Gymnastic Club, Liverpool | WIN KO |
| 1901-09-28 | Harry Smith | LLWLLD | Leeds and County Athletic Club, Leeds | WIN KO |
| 1901-09-23 | Jack McDonald | LLLL | Coronation Hall, Liverpool | WIN KO |
| 1901-09-07 | Mick Lynch | debut | West Hartlepool Gymnasium, West Hartlepool | WIN KO |
| 1901-08-19 | Dido Plumb | WLWWWL | Ginnetts Circus, Newcastle | WIN KO |
| 1901-08-03 | Jack Scales | WWWL | Ginnetts Circus, Newcastle | WIN Points |
| 1901-06-25 | Harry Neumier | WWWL | Ginnetts Circus, Newcastle | WIN KO |
| 1901-05-20 | George Chrisp | WWLLWW | Ginnetts Circus, Newcastle | WIN KO |
| 1901-03-20 | Lachie Thomson | LWWLLW | Ginnetts Circus, Newcastle | WIN KO |
| 1901-02-25 | Harry Smith | LLW | Ginnetts Circus, Newcastle | WIN Technical knockout |
| 1900-11-12 | Jimmy Handler | WLWWWL | Penn Art Club, Philadelphia | WIN Technical knockout |
| 1900-11-06 | Billy Payne | LDDWWW | Star Theater, Philadelphia | NC |
| 1900-10-29 | Jimmy Handler | WWLWWW | Penn Art Club, Philadelphia | WIN |
| 1900-10-15 | Tommy West | WWWWWW | Penn Art Club, Philadelphia | WIN |
| 1900-10-08 | George Cole | WWLWWD | Trenton A.C., Trenton | WIN |
| 1900-10-01 | Jack Bonner | LLWLLL | Penn Art Club, Philadelphia | WIN |
| 1900-09-21 | Andy Walsh | WWLLWD | Industrial Hall, Philadelphia | WIN |
| 1900-07-03 | Jim Adams | DWLL | Des Moines | DRAW Points |
| 1900-06-18 | Jim Adams | DWLL | Baseball Park, Des Moines | NC No Contest |
| 1900-06-14 | Jack Lewis | WLDLDD | Des Moines | WIN KO |
| 1900-06-07 | Charley Bell | WW | Iowa City | WIN KO |
| 1900-05-25 | Jack Mahoney | DDWDDD | Star Theatre, Chicago | WIN Points |
| 1900-04-13 | Bob Long | WWLLWD | Chicago | WIN Points |
| 1900-02-14 | Young Peter Jackson | WWWWWW | Woodward's Pavilion, San Francisco | LOST KO |
| 1900-01-05 | Al Neill | DWWW | Woodward's Pavilion, San Francisco | DRAW Points |
| 1899-09-15 | Tom Tracey | LWLWL | Star Theatre, Chicago | WIN Points |
| 1899-08-29 | Billy Murray | WLLL | Auditorium for fistic carnival, Dubuque | WIN KO |
| 1899-08-04 | Tom McCune | LDLWWW | Jack Leonard's Club, Clinton | WIN KO |
| 1899-07-21 | Shorty Ahearn | DWWWLL | Dearborn A.C., Chicago | WIN Points |
| 1899-06-30 | Walter Nolan | DLWWDW | Star Theatre, Chicago | WIN KO |
| 1899-06-23 | Kid Baxter | LWLWL | Star Theatre, Chicago | WIN Points |
| 1899-05-15 | Tony Drew | LLLW | Trenton | WIN KO |
| 1899-03-20 | George Cole | LDWWWD | Trenton | WIN Points |
| 1899-03-11 | Billy Payne | DWLLDD | Philadelphia | DRAW |
| 1899-02-23 | Billy Payne | DDDDWL | Philadelphia | WIN |
| 1899-01-28 | Jack Collier | WDWWLL | Quaker City A.C., Philadelphia | DRAW |
| 1899-01-21 | George Cole | WDWWWW | Quaker City A.C., Philadelphia | WIN |
| 1899-01-07 | Fred Stricker | LDLDD | Quaker City A.C., Philadelphia | WIN |
| 1898-12-17 | Hugh McWinters | DLWDDL | Pelican A.C., Brooklyn | WIN Points |
| 1898-12-09 | Harry Warren | debut | Arena A.C., Philadelphia | DRAW |
| 1898-11-26 | Kid Carter | DWWDL | Greenwood A.C., Brooklyn | WIN |
| 1898-11-06 | Kid Carter | DWW | Brooklyn | DRAW Points |
| 1898-08-12 | Billy Payne | DDLWLD | Arena A.C., Philadelphia | WIN |
| 1898-04-15 | Young Smyrna | WLLLL | Arena, Philadelphia | WIN |
| 1898-04-10 | Dick Kelly | debut | Philadelphia | WIN Points |
| 1898-04-01 | Billy Payne | DLLLDD | Arena, Philadelphia | WIN |
| 1898-03-25 | Billy Payne | WDLLLD | Arena A.C., Philadelphia | DRAW |
| 1898-02-14 | Jack McCann | LW | Philadelphia | WIN Points |
| 1898-02-04 | Wilmington Jack Daly | DLDWD | Arena, Philadelphia | DRAW |
| 1898-01-31 | Young Smyrna | LWLWL | Philadelphia | WIN Points |
| 1898-01-29 | Izzy Strauss | WWWLDL | East Side A.C., Philadelphia | LOST |
| 1898-01-18 | Paddy Sheehan | DDDW | Maennerchor Hall, Reading | WIN |
| 1898-01-10 | Barney Connors | DW | Baltimore | WIN Points |
| 1897-12-31 | Izzy Strauss | LWWWLD | Arena A.C., Philadelphia | WIN |
| 1897-10-12 | Joe Dougherty | WWWLWL | Philadelphia | WIN KO |
| 1897-07-26 | Martin Judge | WLDWLL | Library Hall, Reading | DRAW Points |
| 1897-06-27 | Jack Hanlon | LDLWD | Reading | WIN Points |
| 1897-06-25 | Martin Judge | LDWLDW | Reading | WIN Points |
| 1897-06-09 | Paddy Sheehan | DD | Reading | DRAW Points |
| 1897-06-07 | Barney Connors | debut | Empire Club, Highlandtown | DRAW Points |
| 1897-06-03 | Charles Bull McCarthy | WLLWLW | Philadelphia | WIN Points |
| 1897-05-24 | Charles Bull McCarthy | WLLWL | Quaker City A.C., Philadelphia | LOST |
| 1897-05-04 | Young Smyrna | D | Harmoula Hall, Chester | NC |
| 1897-04-06 | Billy Payne | LWWWWD | Olympic A.C., Athens | LOST Points |
| 1897-03-22 | Leslie Pearce | LWWDLL | Arena, Philadelphia | LOST |
| 1897-03-15 | Billy Payne | DLWWWW | Arena, Philadelphia | DRAW |
| 1897-02-15 | Dan McConnell | LLDWWL | Arena, Philadelphia | WIN |
| 1897-02-08 | Izzy Strauss | WWWWLD | Quaker City A.C., Philadelphia | WIN |
| 1897-01-28 | Martin Judge | LLWDLD | Tuxedo A.C., Philadelphia | DRAW Points |
| 1897-01-11 | Bobby Dobbs | WDWDD | Washita Hall, Conshohocken | NC |
| 1896-12-23 | Bobby Dobbs | WWDWD | Chester | DRAW Points |
| 1896-12-19 | George Russell | debut | Nonpareil A.C., Philadelphia | WIN Points |
| 1896-12-14 | Izzy Strauss | WWWWWL | Caledonian A.C., Philadelphia | DRAW Points |