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| Name: | Jack Brennan |
| Given name: | Jack |
| Birth place: | St. Louis, MO, USA |
| Birthday: | 9/15/1863 |
| Height: | 0 inches |
| Weight: | 155 lbs |
| Batting: | Unknown |
| Throwing: | Unknown |
| Age/Age at time of death: | 50 |
| Year | Team Name | Batting Statistics | Pitching Statistics | Fielding Statistics |
|---|---|---|---|---|
| 1884 | St. Louis Maroons | 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 | St. Louis Maroons | 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 |
| 1888 | Kansas City Cowboys | Hits: 75 At Bats: 364 HR: 1 RBI: 48 | Wins: 0 Losses: 2 Total Games: 2 Strikeouts: 2 Shutouts: 0 | Position: 3B Errors: 20 Double Plays: 9 Assists: 103 |
| 1889 | Philadelphia Athletics | Hits: 43 At Bats: 186 HR: 0 RBI: 18 | Wins: 0 Losses: 1 Total Games: 5 Strikeouts: 8 Shutouts: 0 | Position: 2B Errors: 8 Double Plays: 4 Assists: 28 |
| 1890 | Cleveland Infants | 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 |