Otto Sieloff boxer
- bouts
- 96
- won
- 44
- lost
- 28
- draw
- 24
- Status
- inactive
- Division
- welterweight
- Debut
- 1897-10-30
- Height
- 5′ 7″/170cm
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1916-01-01 | Eddie McFarland | WL | Chicago | WIN KO |
| 1907-12-13 | Clarence Warner | debut | Aurora Coliseum, Aurora | WIN KO |
| 1907-07-16 | Clarence English | WWWDWW | Omaha | LOST KO |
| 1907-05-07 | Tom McCune | LWLLLL | Eagles Hall, Duluth | LOST Technical knockout |
| 1907-04-24 | Curley Ulrich | WWWWLW | Eveleth | DRAW Points |
| 1907-01-09 | Jerry Murphy | D | Auditorium, Indianapolis | LOST Points |
| 1906-12-26 | Jack Reed | debut | Peoria | LOST KO |
| 1906-11-29 | Jimmy Gardner | WDWDWW | Princess Rink, Fort Wayne | LOST KO |
| 1906-04-05 | Cyclone Johnny Thompson | DDDLDD | Young Men's Gym Club, New Orleans | LOST KO |
| 1906-03-15 | Milt Kinney | WWDLLW | Central Park Pavilion, Peoria | WIN Points |
| 1906-02-19 | Barney Furey | DLLWWL | Central Park Pavilion, Peoria | DRAW Points |
| 1906-02-15 | Cyclone Johnny Thompson | LDLDDD | Ottawa | DRAW Points |
| 1905-12-22 | Jack Dougherty | WWWDWW | Panorama Building, Milwaukee | LOST Points |
| 1905-10-13 | Cyclone Johnny Thompson | WWLDLD | Beloit | DRAW Points |
| 1905-06-15 | Kid Williams | WL | Lyceum Theater, Duluth | DRAW Points |
| 1905-03-24 | Mike Twin Sullivan | DWWWWW | City Hall, Lewiston | LOST Technical knockout |
| 1905-03-22 | Willie Fitzgerald | WWWWWW | Kalamazoo | LOST Technical knockout |
| 1905-01-31 | Charley Coffee | L | Detroit A.C., Detroit | WIN Points |
| 1905-01-20 | Dick Fitzpatrick | LDWDWD | Academy of Music, Kalamazoo | LOST Points |
| 1905-01-06 | Jack Dougherty | WWWWDW | Panorama Building, Milwaukee | WIN Points |
| 1904-12-27 | Charley Coffee | debut | Detroit A.C., Detroit | WIN Points |
| 1904-12-07 | Willie Fitzgerald | LDWWWW | Indianapolis | LOST KO |
| 1904-11-14 | Dick Green | WL | Harlem A.C., Chicago | WIN Points |
| 1904-10-15 | Dick Fitzpatrick | LDLDLD | Chicago A.A., Chicago | LOST Points |
| 1904-10-13 | Kid Farmer | WLWWWW | Auditorium, Indianapolis | DRAW Points |
| 1904-06-14 | Dick Fitzpatrick | WLDLDL | Apollo Hall, Chicago | DRAW Points |
| 1904-05-24 | Jerry McCarthy | DWWWWL | Salt Palace, Salt Lake City | LOST KO |
| 1904-04-25 | George Memsic | WWWDDD | Indianapolis A.C., Indianapolis | DRAW |
| 1904-03-25 | George Memsic | DWWWDD | Indianapolis A.C., Indianapolis | DRAW Points |
| 1904-03-10 | George Memsic | DDWWWD | Ashley Club, Chicago | DRAW Points |
| 1904-02-19 | Honey Mellody | DWWWWL | Battery D Armory, Chicago | LOST KO |
| 1904-01-29 | Jerry McCarthy | DDWWWW | Salt Lake City | WIN Points |
| 1903-12-23 | Henry Fagin | LDDLDL | 9th Ward A.C., Chicago | WIN Points |
| 1903-11-24 | Willie Fitzgerald | WLWDWW | Port Huron | LOST KO |
| 1903-11-20 | Mickey Riley | DDDDD | Milwaukee Boxing Club, Milwaukee | WIN Points |
| 1903-10-10 | Buddy Ryan | WLDWDL | Chicago | LOST Points |
| 1903-06-18 | Henry Fagin | DLLDLL | Empire Theater, Indianapolis | DRAW Points |
| 1903-05-22 | Dick Fitzpatrick | WDWWWL | Milwaukee | DRAW Points |
| 1903-05-13 | Martin Judge | LLLLLD | Indianapolis | WIN Points |
| 1903-04-30 | Mike Ward | WWWWWW | Auditorium, Port Huron | LOST Points |
| 1903-04-18 | Tim Kearns | WWLWWW | Milwaukee A.C., Milwaukee | WIN KO |
| 1903-01-03 | Tim Kearns | WWWDWW | Chicago A.A., Chicago | WIN Points |
| 1902-12-16 | Henry Fagin | WDLLDL | Aurora Hall, Chicago | WIN KO |
| 1902-10-25 | Steve Crosby | WWWWDL | Chicago A.A., Chicago | WIN Points |
| 1902-10-17 | Art Simms | LWDWLL | Milwaukee Boxing Club, Milwaukee | DRAW Points |
| 1902-09-17 | Jack Carrig | LLWLDD | Saint Paul | DRAW Points |
| 1902-09-05 | Martin Duffy | WWWWLL | Brand's Hall, Chicago | WIN Points |
| 1902-07-18 | Tom Couhig | LLWWWW | Brand's Hall, Chicago | DRAW Points |
| 1902-05-26 | Art Simms | DLLWDW | Saint Paul | WIN KO |
| 1902-05-08 | Tommy Ryan | LLDDDD | Chicago | WIN KO |
| 1902-03-27 | Art Simms | WWDLLW | Oshkosh | DRAW |
| 1902-03-18 | Harry Williams | debut | Saint Paul | WIN KO |
| 1902-02-18 | Kid Thomas | LWLLLL | Badger A.C., Milwaukee | WIN |
| 1902-02-12 | Danny Duane | WWWDLW | Acme A.C., Chicago | WIN KO |
| 1902-02-04 | Kid McPartland | LWLWW | Milwaukee Boxing Club, Milwaukee | LOST KO |
| 1902-01-23 | Dave Barry | LWWLL | Pyramid A.C., Chicago | WIN Points |
| 1901-12-05 | Martin Duffy | WWWWWW | Oshkosh | LOST Points |
| 1901-05-03 | Curley Supples | WLDDDD | Milwaukee Boxing Club, Milwaukee | WIN KO |
| 1901-04-24 | Martin Duffy | WWWWWW | Oshkosh A.C., Oshkosh | WIN Points |
| 1901-04-05 | Perry Queenan | LWWWWD | Milwaukee Boxing Club, Milwaukee | DRAW Points |
| 1901-03-03 | Charley 'Young' Kenney | LLDLWL | Oshkosh | WIN KO |
| 1901-02-07 | Jack Lewis | LDDLLD | Oshkosh A.C., Oshkosh | LOST |
| 1901-01-11 | Rufe Turner | WWWWWW | Colorado A.C., Denver | LOST KO |
| 1900-12-13 | Martin Duffy | WDWWWW | Tattersall's, Chicago | LOST Points |
| 1900-10-16 | Joe Gans | WWDWWW | Olympic A.C., Denver | LOST KO |
| 1900-10-02 | Dal Hawkins | WWWLLW | Tattersall's, Chicago | LOST Points |
| 1900-08-30 | Charley 'Young' Kenney | LLLLLW | Denver | WIN Points |
| 1900-08-03 | Young Peter Jackson | WWDDWW | Olympic A.C., Denver | WIN Points |
| 1900-05-21 | Curley Supples | DWWWDW | Grand Opera House, Akron | WIN Points |
| 1900-04-14 | Jimmy Murray | LLDLDL | Chicago A.A., Chicago | WIN Points |
| 1900-02-23 | Tommy Cleary | WDWDLW | Star A.C., Chicago | WIN Points |
| 1900-01-12 | Perry Queenan | DWDLLW | Star Theatre, Chicago | DRAW Points |
| 1899-11-30 | Jim Popp | LDWDWL | Detroit | LOST |
| 1899-11-03 | Buck Stelzer | WDWWDD | Light Guard Armory, Detroit | WIN Points |
| 1899-09-15 | Kid McPartland | LWWDWW | Broadway A.C., Brooklyn | LOST Points |
| 1899-08-14 | Harry Lemons | LWWLLL | Coney Island A.C., Brooklyn | WIN Technical knockout |
| 1899-07-10 | Matty Matthews | WWDDWD | Coney Island A.C., Brooklyn | LOST Technical knockout |
| 1899-05-27 | Jim Popp | DWLDWD | Hawthorne Club, Cheektowaga | LOST KO |
| 1899-04-19 | Chicago Jack Daly | WLDWDW | Rockport A.C., Rockport | DRAW Points |
| 1899-03-31 | Jack Lewis | WWDWDW | Fort Dearborn A.C., Chicago | WIN Points |
| 1899-02-20 | Spike Sullivan | WWWWWD | Olympic A.C., Buffalo | LOST KO |
| 1899-01-28 | Frank Bartley | WWWDDW | Chicago A.A., Chicago | WIN Points |
| 1899-01-14 | Shorty Ahearn | LDDWWD | Chicago A.A., Chicago | WIN Points |
| 1898-12-24 | Tom McCune | LDLLWL | Chicago A.A., Chicago | WIN Points |
| 1898-11-12 | Kid Carter | DWWD | Greenwood A.C., Brooklyn | WIN |
| 1898-10-08 | Frank Casey | WWWDL | Pelican A.C., Brooklyn | WIN Technical knockout |
| 1898-09-27 | Billy Hill | DWLWWW | City Point A.C., Boston | DRAW Points |
| 1898-09-03 | Black Griffo | LDDDDW | Pelican A.C., Brooklyn | WIN Points |
| 1898-08-12 | Tom Broderick | WDWLLW | Lenox A.C., New York | LOST KO |
| 1898-07-08 | Tim Kearns | DDWDW | Lenox A.C., New York | WIN KO |
| 1898-05-26 | Jack Carrig | WDDWL | America A.A., Chicago | DRAW Points |
| 1898-04-02 | Kid Roberson | debut | America A.C., Chicago | WIN Points |
| 1898-03-17 | George Kerwin | WWWWW | Tattersall's, Chicago | DRAW Points |
| 1898-03-09 | Jimmy Casey | LDD | Auditorium, Detroit | WIN |
| 1898-02-12 | Frank Garrard | WDLDDL | Chicago A.A., Chicago | WIN KO |
| 1898-01-19 | Jack Lewis | DD | Oxford Hall, Chicago | DRAW Points |
| 1897-12-23 | Jack Lewis | D | Chicago A.A., Chicago | DRAW Points |
| 1897-12-12 | Kid Dooley | D | Chicago A.A., Chicago | WIN KO |
| 1897-11-28 | Jack Lewis | debut | Chicago A.C., Chicago | DRAW Points |
| 1897-11-13 | Johnson | debut | Chicago A.A., Chicago | WIN KO |
| 1897-10-30 | La Feber | debut | Chicago A.A., Chicago | DRAW Points |
