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| Name: | Dan O'Leary |
| Given name: | Daniel |
| Birth place: | Detroit, MI, USA |
| Birthday: | 10/22/1856 |
| Height: | 70 inches |
| Weight: | 165 lbs |
| Batting: | Left-handed |
| Throwing: | Unknown |
| Age/Age at time of death: | 65 |
| Year | Team Name | Batting Statistics | Pitching Statistics | Fielding Statistics |
|---|---|---|---|---|
| 1879 | Providence Grays | Hits: 3 At Bats: 13 HR: 0 RBI: 0 | Wins: 43 Losses: 19 Total Games: 64 Strikeouts: 155 Shutouts: 11 | Position: 1B Errors: 4 Double Plays: 0 Assists: 0 |
| 1880 | Boston Red Caps | Hits: 1 At Bats: 4 HR: 0 RBI: 0 | Wins: 26 Losses: 29 Total Games: 63 Strikeouts: 118 Shutouts: 3 | Position: C Errors: 2 Double Plays: 0 Assists: 5 |
| 1881 | Detroit Wolverines | Hits: 137 At Bats: 343 HR: 1 RBI: 82 | Wins: 0 Losses: 3 Total Games: 3 Strikeouts: 2 Shutouts: 0 | Position: 1B Errors: 24 Double Plays: 48 Assists: 43 |
| 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 |
| 1884 | Cincinnati Outlaw 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 |