| Name: | Tom O'Brien |
| Given name: | Thomas H. |
| Birth place: | Salem, MA, USA |
| Birthday: | 6/22/1860 |
| Height: | 73 inches |
| Weight: | 185 lbs |
| Batting: | Right-handed |
| Throwing: | Right-handed |
| Age/Age at time of death: | 60 |
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| Name: | Tom O'Brien |
| Given name: | Thomas H. |
| Birth place: | Salem, MA, USA |
| Birthday: | 6/22/1860 |
| Height: | 73 inches |
| Weight: | 185 lbs |
| Batting: | Right-handed |
| Throwing: | Right-handed |
| Age/Age at time of death: | 60 |
| Year | Team Name | Batting Statistics | Pitching Statistics | Fielding Statistics |
|---|---|---|---|---|
| 1882 | Worcester Ruby Legs | Hits: 126 At Bats: 348 HR: 1 RBI: 83 | Wins: 4 Losses: 10 Total Games: 14 Strikeouts: 47 Shutouts: 0 | Position: 1B Errors: 45 Double Plays: 42 Assists: 27 |
| 1883 | Baltimore Orioles | Hits: 0 At Bats: 4 HR: 0 RBI: 1 | Wins: 0 Losses: 1 Total Games: 1 Strikeouts: 0 Shutouts: 0 | Position: P Errors: 0 Double Plays: 0 Assists: 1 |
| 1884 | Boston Reds | Hits: 10 At Bats: 52 HR: 0 RBI: 2 | Wins: 1 Losses: 0 Total Games: 1 Strikeouts: 2 Shutouts: 0 | Position: 3B Errors: 10 Double Plays: 2 Assists: 15 |
| 1885 | Baltimore Orioles | Hits: 0 At Bats: 5 HR: 0 RBI: 0 | Wins: 13 Losses: 12 Total Games: 25 Strikeouts: 79 Shutouts: 1 | Position: 3B Errors: 2 Double Plays: 0 Assists: 1 |
| 1887 | New York Metropolitans | Hits: 128 At Bats: 463 HR: 4 RBI: 77 | Wins: 1 Losses: 0 Total Games: 2 Strikeouts: 1 Shutouts: 0 | Position: 3B Errors: 0 Double Plays: 1 Assists: 7 |
| 1890 | Rochester Broncos | Hits: 1 At Bats: 7 HR: 0 RBI: 1 | Wins: 0 Losses: 2 Total Games: 3 Strikeouts: 1 Shutouts: 0 | Position: P Errors: 0 Double Plays: 0 Assists: 4 |