| Rank | WAA | IP | ERA | Gs | Gr | Tm |
|---|---|---|---|---|---|---|
| +010+ | 3.24 | 104.3 | 1.47 | 13 | 0 | NYN |
| Date | Rank | WAA | TeamID |
|---|---|---|---|
| 19680514 | +019+ | 1.42 | NYN |
| 19680528 | +012+ | 2.04 | NYN |
| 19680611 | +006+ | 3.05 | NYN |
| 19680616 | +010+ | 3.24 | NYN |
| 19680620 | +010+ | 3.39 | NYN |
| 19680704 | +022+ | 2.89 | NYN |
| 19680721 | +016+ | 3.80 | NYN |
| 19680804 | +014+ | 4.48 | NYN |
| 19680818 | +013+ | 4.94 | NYN |
| 19680901 | +014+ | 5.22 | NYN |
| 19680915 | +014+ | 5.82 | NYN |
| 19680929 | +020+ | 5.23 | 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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