Pat O'Brien boxer
- bouts
- 19
- won
- 2
- lost
- 15
- draw
- 2
- Status
- inactive
- Division
- welterweight
- Debut
- 1957-01-14
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- Canada
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1959-04-11 | George Monroe | WWWWWL | Mechanics Hall, Worcester | LOST Points |
| 1959-03-26 | Joey Donovan | LWWWWW | Sunnyside Garden, Sunnyside, Queens | LOST Unanimous decision |
| 1959-02-23 | Tommy Garrow | WWWWLW | Arcadia Ballroom, Providence | LOST Unanimous decision |
| 1958-06-12 | Charlie Cummings | LLLWWL | Connie Mack Stadium, Philadelphia | LOST Points |
| 1958-03-04 | John Tombley | WWLDDW | Auditorium, Miami Beach | LOST Points |
| 1958-01-20 | Sid Lugo | WWWWWW | St. Nicholas Arena, New York | LOST Points |
| 1958-01-10 | Mike Spataro | DLWWWW | Madison Square Garden, New York | LOST Unanimous decision |
| 1957-12-11 | Aldo Mente | WLLWWW | Fort Homer Hesterly Armory, Tampa | DRAW Points |
| 1957-11-04 | Joe Fusco | LLWLLW | St. Nicholas Arena, New York | LOST Unanimous decision |
| 1957-10-05 | Roger Harvey | DDLLWW | Bermuda Tennis Stadium, Hamilton | LOST Points |
| 1957-08-31 | Roger Harvey | WDDLLW | Bermuda Tennis Stadium, Hamilton | LOST Unanimous decision |
| 1957-08-05 | Paul Berrios | LWL | St. Nicholas Arena, New York | WIN Technical knockout |
| 1957-06-10 | Eddie Lynch | WWWWWL | St. Nicholas Arena, New York | LOST Unanimous decision |
| 1957-05-20 | Artie Cintron | LLWLD | St. Nicholas Arena, New York | WIN Points |
| 1957-04-22 | Eddie Prince | WLLLLL | St. Nicholas Arena, New York | LOST Points |
| 1957-04-06 | George Thomas | debut | High School Gym, Arnold | DRAW Points |
| 1957-03-25 | Don Ross | WWW | Maple Leaf Gardens, Toronto | LOST Points |
| 1957-03-04 | George Ferenczi | DW | Maple Leaf Gardens, Toronto | LOST Split-decision |
| 1957-01-14 | Don Ross | W | Maple Leaf Gardens, Toronto | LOST Points |