| Rank | WAA | IP | ERA | Gs | Gr | Tm |
|---|---|---|---|---|---|---|
| +018+ | 5.11 | 131.3 | 1.99 | 17 | 0 | NYN |
| Date | Rank | WAA | TeamID |
|---|---|---|---|
| 19690512 | XXXXX | 0.00 | NYN |
| 19690527 | XXXXX | 0.15 | NYN |
| 19690610 | +053+ | 2.07 | NYN |
| 19690624 | +011+ | 4.24 | NYN |
| 19690708 | +017+ | 4.63 | NYN |
| 19690725 | +018+ | 5.11 | NYN |
| 19690807 | +020+ | 5.48 | NYN |
| 19690821 | +024+ | 5.55 | NYN |
| 19690904 | +043+ | 5.06 | NYN |
| 19690918 | +020+ | 6.73 | NYN |
| 19691002 | +020+ | 7.22 | NYN |
Jerry Koosman Post Season Games
| Rank | WAA | IP | ERA | Gs | Gr | Tm |
|---|---|---|---|---|---|---|
| XXXXX | -0.18 | 0.3 | 27 | 0 | 1 | CHA |
| XXXXX | 0.21 | 40 | 3.38 | 6 | 0 | NYN |
| XXXXX | 0.03 | 40.3 | 3.57 | 0 | 0 | TOT |
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