Not enough days in 1990 season to compile WAA record.
| Date | Rank | WAA | TeamID |
|---|---|---|---|
| 19900416 | XXXXX | -0.07 | NYN |
| 19900430 | XXXXX | -0.52 | NYN |
| 19900514 | XXXXX | 0.04 | NYN |
| 19900528 | XXXXX | 0.60 | NYN |
| 19900611 | XXXXX | 1.14 | NYN |
| 19900625 | +059+ | 1.87 | NYN |
| 19900711 | +077+ | 1.72 | NYN |
| 19900725 | +084+ | 1.86 | NYN |
| 19900808 | +043+ | 2.88 | NYN |
| 19900822 | +052+ | 2.99 | NYN |
| 19900905 | +065+ | 2.81 | NYN |
| 19900919 | +086+ | 2.45 | NYN |
| 19901003 | +107+ | 2.18 | NYN |
Gregg Jefferies Post Season Games
| Rank | WAA | BA | OBP | PA | Rbis | Runs | Tm |
|---|---|---|---|---|---|---|---|
| XXXXX | -0.28 | 0.333 | 0.438 | 32 | 1 | 3 | NYN |
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