Wildcat Willie O'Brien boxer
- bouts
- 106
- won
- 36
- lost
- 36
- draw
- 31
- Status
- inactive
- Division
- lightweight
- Debut
- 1920-02-25
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1929-10-16 | Howard Fritz | WW | Wilmington Bowl, Wilmington | LOST KO |
| 1929-08-02 | Joe Olea | debut | East Washington Street Arena, Phoenix | LOST Technical knockout |
| 1927-08-31 | Tim Vahey | WDWWWW | National Hall, San Francisco | LOST Points |
| 1927-08-02 | Johnny Spino | WWDWWW | Forman's Arena, San Jose | DRAW Points |
| 1926-12-10 | Joe Cardoza | WWWWD | Legion Stadium, Hollywood | LOST Technical knockout |
| 1926-11-05 | Sammy McLarnin | WWW | Legion Stadium, Hollywood | LOST Technical knockout |
| 1926-07-28 | Eddie Roberts | WWWWWW | National Hall, San Francisco | LOST Technical knockout |
| 1926-07-21 | Oakland Billy Harms | WLWWWW | National Hall, San Francisco | DRAW Points |
| 1926-07-14 | Oakland Billy Harms | WWLWWW | National Hall, San Francisco | LOST Points |
| 1926-07-07 | Battling Manning | LWWLWL | National Hall, San Francisco | WIN Points |
| 1926-06-25 | Joe Vargas | DDDWDL | Taft | LOST Points |
| 1926-06-18 | Eddie Landon | LLLLLL | Sacramento | WIN Points |
| 1926-06-09 | Jimmy Adams | WWWLLL | National Hall, San Francisco | WIN Points |
| 1926-06-04 | Patricio Yangeco | WL | Dreamland Rink, San Francisco | WIN Points |
| 1926-06-02 | Gilbert Attell | LDDWLW | National Hall, San Francisco | WIN Points |
| 1926-05-21 | Tim Vahey | LDDDWW | Santa Rosa | DRAW Points |
| 1926-05-11 | Pedro Amador | DWWWWW | Culver City | LOST Points |
| 1926-04-30 | Mickey Biss | LLWWWW | Legion Stadium, Hollywood | DRAW Points |
| 1926-04-06 | Frankie Mitro | debut | Culver City | WIN Points |
| 1926-03-12 | Marcelo Romero | debut | Legion Stadium, Hollywood | WIN KO |
| 1926-02-16 | Tommy Schull | LDDLLL | Culver City | WIN Points |
| 1926-01-19 | Jesus Abuskie | debut | Culver City | WIN KO |
| 1926-01-07 | Johnny Adams | LWWWWW | American Legion, San Bernardino | LOST Technical knockout |
| 1925-08-14 | Kid Kopecks | LWWDDL | Bakersfield Arena, Bakersfield | WIN Points |
| 1925-07-31 | Joe Vargas | WWWWWW | Bakersfield Arena, Bakersfield | DRAW Points |
| 1925-07-17 | Cy Murphy | LLDWWD | Legion Stadium, Hollywood | LOST Points |
| 1925-06-19 | Tommy Schull | debut | Legion Stadium, Hollywood | DRAW Points |
| 1925-05-19 | Ray Long | DWWLWW | Kansas City | LOST |
| 1925-04-08 | Danny Sacks | DWLWWW | Dreamland Arena, San Diego | LOST Points |
| 1925-03-25 | Frankie Cruz | DLDLWW | Dreamland Arena, San Diego | WIN Points |
| 1925-03-18 | Sailor Fay Kosky | LWWWLL | Dreamland Arena, San Diego | WIN Points |
| 1925-02-21 | Georgie Rivers | WWWWDW | Lyceum A.C., Los Angeles | LOST Points |
| 1925-01-26 | Eddie Sylvester | DWWWLL | Taft Arena, Taft | NC No Contest |
| 1925-01-23 | Earl Force | LWLDWW | Sacramento | LOST |
| 1925-01-22 | Joe Bernard | LL | San Bernardino | NC No Contest |
| 1925-01-15 | John Battling Ward | LDDWDW | San Bernardino | WIN Points |
| 1925-01-03 | Ad Cadena | LLDWWW | Lyceum A.C., Los Angeles | LOST Points |
| 1924-11-22 | John Battling Ward | WLLLLL | Lyceum A.C., Los Angeles | DRAW Points |
| 1924-10-17 | KO Kelly | LLWWWD | Legion Stadium, Hollywood | LOST Points |
| 1924-09-19 | Johnny Weber | DWLLDD | Arena, Huntington Beach | DRAW Points |
| 1924-09-10 | Billy Young | LLWLLD | Wilmington Bowl, Wilmington | LOST Points |
| 1924-09-03 | Johnny Datto | WWLLWL | Dreamland Arena, San Diego | DRAW Points |
| 1924-08-27 | Larry Murphy | LWLWDW | Wilmington Bowl, Wilmington | DRAW Points |
| 1924-07-30 | Larry Murphy | WDDLWL | Auditorium, Oakland | LOST Points |
| 1924-07-16 | Billy Wallace | LDLDWW | Auditorium, Oakland | LOST Points |
| 1924-06-20 | Pickles Martin | DLWWWW | Dreamland Rink, San Francisco | LOST Points |
| 1924-06-13 | Sammy Compagno | WWWWWW | Dreamland Rink, San Francisco | DRAW Points |
| 1924-06-06 | Sammy Compagno | LWWWWW | Dreamland Rink, San Francisco | LOST Points |
| 1924-06-03 | Babe Herman | LWWWLW | Arena, Vernon | LOST Points |
| 1924-05-09 | Jimmy Hackley | LDDLLW | Compton | DRAW Points |
| 1924-04-08 | Larry Murphy | LLWDW | Arena, Vernon | LOST Points |
| 1924-03-21 | Johnny Adams | DWDWLW | Legion Stadium, Hollywood | LOST Points |
| 1924-03-12 | Kid Bello | DLLWWD | Dreamland Arena, San Diego | LOST Points |
| 1924-02-19 | Harry LaBarre | WWWWD | Arena, Vernon | WIN Points |
| 1923-12-21 | Pete Daley | LLLWLW | Dreamland Rink, San Francisco | LOST Points |
| 1923-11-09 | Young Georges Carpentier | DLLWLW | Legion Stadium, Hollywood | DRAW Points |
| 1923-11-01 | Jackie Jones | DWWWWL | Pasadena | DRAW Points |
| 1923-10-19 | Johnny Adams | DWWWWW | Legion Stadium, Hollywood | DRAW Points |
| 1923-10-11 | Joe Layman | WLDDWD | Armory, Pasadena | DRAW Points |
| 1923-10-09 | Larry Murphy | LDLDLD | Arena, Vernon | DRAW Points |
| 1923-10-04 | Babe Romeo | debut | Armory, Pasadena | WIN Technical knockout |
| 1923-09-28 | Joe Leopold | DWWWDL | Legion Stadium, Hollywood | WIN Points |
| 1923-09-18 | Scotty McGlicky | debut | Orange County A.C., Santa Ana | DRAW Points |
| 1923-08-31 | Frankie Dean | DDLLDL | Legion Stadium, Hollywood | DRAW Points |
| 1923-08-15 | Tommy Cello | LDWWWW | Auditorium, Oakland | LOST Points |
| 1923-08-01 | Larry Murphy | WWDDLD | Legion Stadium, Hollywood | WIN Points |
| 1923-06-29 | Jimmy Hackley | LLWWLW | Legion Stadium, Hollywood | WIN Points |
| 1923-06-08 | Young Georges Carpentier | WLWLWD | Legion Stadium, Hollywood | LOST KO |
| 1923-06-01 | Sailor Al Walters | LLDLWL | Legion Stadium, Hollywood | WIN Points |
| 1923-05-18 | Tod Morgan | WWWWWW | Legion Stadium, Hollywood | LOST Points |
| 1923-04-06 | Pete Herman | DLLLLW | Legion Stadium, Hollywood | WIN |
| 1923-03-30 | Larry Murphy | WWWWDD | Legion Stadium, Hollywood | WIN Points |
| 1923-03-09 | Frankie McCann | WDDWDD | Legion Stadium, Hollywood | LOST Points |
| 1923-02-16 | Larry Murphy | WDWWWW | Legion Stadium, Hollywood | DRAW Points |
| 1923-01-19 | Kid Moha | LDLDLL | Legion Stadium, Hollywood | WIN Points |
| 1923-01-12 | Jimmy Hackley | WDWWWD | Legion Stadium, Hollywood | DRAW Points |
| 1923-01-05 | Jimmy Hackley | LWDWWW | Legion Stadium, Hollywood | DRAW Points |
| 1922-12-29 | George Sirey | LLLLLL | Legion Stadium, Hollywood | WIN Points |
| 1922-12-15 | Eddie Buell | D | Legion Stadium, Hollywood | WIN Points |
| 1922-12-08 | Eddie Buell | debut | Legion Stadium, Hollywood | DRAW Points |
| 1922-12-06 | Joe Goose | WWLWWW | Dreamland Arena, San Diego | WIN Points |
| 1922-11-29 | Kid Manuel | LL | Dreamland Arena, San Diego | WIN Points |
| 1922-11-14 | Len Malody | LWLDDW | Arena, Vernon | LOST Points |
| 1922-07-25 | Sammy Butler | debut | Forum, Wichita | LOST |
| 1922-07-04 | Jimmy Kid Hartman | DLWW | Convention Hall, Hutchinson | LOST |
| 1922-06-02 | Kid Williams | debut | National Guard Armory, Oklahoma City | WIN KO |
| 1922-03-24 | Cecil Como | WWWDL | Arkansas City | DRAW |
| 1922-02-24 | Paul McGuire | L | Convention Hall, Hutchinson | DRAW |
| 1922-02-20 | Jack Callopy | WWW | Forum, Wichita | WIN |
| 1922-01-27 | Jimmy Kid Hartman | D | Convention Hall, Hutchinson | WIN |
| 1922-01-17 | New Zealand Kid | debut | Forum, Wichita | WIN Technical knockout |
| 1921-12-23 | Jess Stevenson | debut | Convention Hall, Hutchinson | WIN KO |
| 1921-04-15 | Art Brugger | WDWWLD | Wasatch A.C., Ogden | DRAW Points |
| 1921-04-11 | Lou Paluso | WWWDDW | Hippodrome Theater, Salt Lake City | LOST Points |
| 1921-04-01 | Percy Gilbert | WDLDDL | Wasatch A.C., Ogden | WIN KO |
| 1921-03-10 | Sammy Corbett | WLWLWD | San Bernardino | WIN KO |
| 1921-02-10 | Chief Cyrus | WWL | San Bernardino | WIN KO |
| 1920-11-24 | Russ Pierce | W | Dreamland Arena, San Diego | LOST Points |
| 1920-11-11 | Babe Flores | DWLLLW | Gate City A.C., San Bernardino | WIN Points |
| 1920-10-29 | Ike Smith | WWDDDW | Bakersfield | DRAW Points |
| 1920-10-25 | Billy Barich | debut | Taft | LOST Points |
| 1920-10-21 | Freddie Harris | WWLWDL | Gate City A.C., San Bernardino | DRAW Points |
| 1920-10-07 | Jimmy Musso | LWLDLW | San Bernardino | NC No Contest |
| 1920-09-23 | Young Sharkey | WDLWDW | Santa Barbara | DRAW Points |
| 1920-09-22 | Ike Smith | WDWWWW | Fairgrounds, Ventura | DRAW Points |
| 1920-09-16 | Ike Smith | DWDWWW | Santa Barbara | LOST Points |
| 1920-05-19 | Russ Pierce | debut | Dreamland Arena, San Diego | LOST Points |
| 1920-05-12 | Young Tokio | LLWDDD | Dreamland Arena, San Diego | WIN Points |
| 1920-04-15 | Kid Glass | debut | Grand Opera House, Santa Ana | WIN Points |
| 1920-03-31 | Sailor Fred Kramer | WWLDDL | Dreamland Arena, San Diego | DRAW Points |
| 1920-03-10 | Young Tokio | LLWDD | Dreamland Arena, San Diego | DRAW Points |
| 1920-02-25 | Young Tokio | LLWD | Dreamland Arena, San Diego | DRAW Points |
