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| Name | Team | Age |
| John Kosman | Retired (1970, Age 34) | Died (2009, Age 74) |
| Drafted | Position | Bats/Throws |
| Round 3, Pick 48 (1953) |
SS | B/R |
| League | Option Years
|
Majors Service Time |
| Harmon Killebrew League | 0 | 9 years (110 games) |
| Total Rating
|
Arm | Range |
| Contact vs R | Contact vs L | Speed |
| Power vs R | Power vs L | Bunting |
| Endurance | Velocity | Control |
| Leadership
|
Mentor vs RHP
|
Mentor vs LHP
|
| Health
|
Injured Days
|
Birthday |
| 0 | 12/10/1935 | |
| WS Rings | WS Appearances | LCS Appearances |
| 0 | 0 | 2 |
| Alt Pos (2B) | Alt Pos (SS) | Alt Pos (1B) |
| (99.6 %) | (92.0 %) | (8.4 %) |
Stats | Splits | Playoffs | Positions | Improvements | Past Skills | Awards | Fielding | Game Log
| Date | Transaction |
| 1970-11-01 | John Kosman has retired from the Free Agency Pool |
| 1970-05-12 | The Pittsburgh Prisoners have waived John Kosman. |
| 1970-04-08 | The Pittsburgh Prisoners have promoted Jason Pick to the major league team. The Pittsburgh Prisoners have designated John Kosman for assignment. |
| 1966-04-05 | A trade has been completed between the Washington Boondoggles and the Pittsburgh Pain. The Pittsburgh Pain receive Charlie Graney, John Kosman, Al Moeller, Joe Atkinson from the Washington Boondoggles in exchange for Rod Leheny, Jerry Hogg. |
| 1964-04-01 | The Washington Boondoggles have promoted Joe Waugh to the major league team. The Washington Boondoggles have promoted John Kosman to the major league team. The Washington Boondoggles have promoted Rod Leheny to the major league team. The Washington Boondoggles have promoted Joel Speed to the major league team. |
| 1962-10-03 | The Washington Boondoggles have sent Darin Comer to the minors. The Washington Boondoggles have designated John Kosman for assignment. The Washington Boondoggles have designated Justin Upshaw for assignment. The Washington Boondoggles have sent Larry Kohlman to the minors. The Washington Boondoggles have sent Joel Speed to the minors. The Washington Boondoggles have sent Joe Leovich to the minors. The Washington Boondoggles have sent Jeff Severson to the minors. The Washington Boondoggles have sent George Welch to the minors. The Washington Boondoggles have designated Hutch Sawatski for assignment. The Washington Boondoggles have sent Len Allison to the minors. The Washington Boondoggles have sent Doc Fox to the minors. The Washington Boondoggles have sent Jamie Sparrow to the minors. The Washington Boondoggles have designated Joe Waugh for assignment. The Washington Boondoggles have sent Sergio Stirnweiss to the minors. |
| 1962-09-20 | The Washington Boondoggles have promoted John Kosman to the major league team. |
| 1959-05-10 | The Washington Boondoggles have designated John Kosman for assignment. |
| 1958-08-25 | The Washington Boondoggles have promoted John Kosman to the major league team. |
| 1957-07-22 | The Washington Boondoggles have promoted John Kosman to the major league team. |
| 1957-04-01 | The Washington Boondoggles have promoted Matt Serafini to the major league team. The Washington Boondoggles have sent John Kosman to the minors. |
| 1954-08-25 | The Washington Boondoggles have promoted John Kosman to the major league team. |