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| 1979 | Midland | Tex | AA | 22 | 18 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .783 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 4 | 14 | 5 |
| 1980 | Midland | Tex | AA | 23 | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .967 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 23 | 36 | 2 |
| 1981 | Midland | Tex | AA | 24 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .909 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 13 | 17 | 3 |
| | Iowa | Amer | AAA | 24 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .880 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 2 | 20 | 3 |
| 1982 | Midland | Tex | AA | 25 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .912 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 15 | 37 | 5 |
| 1983 | Iowa | Amer | AAA | 26 | 31 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .925 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 13 | 36 | 4 |
| 1984 | Iowa | Amer | AAA | 27 | 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .909 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 17 | 23 | 4 |
| 1985 | Iowa | Amer | AAA | 28 | 32 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .979 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 17 | 29 | 1 |
| | Chi Cubs | NL | MLB | 28 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.000 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0 | 2 | 0 |
| 1986 | Phoenix | PCL | AAA | 29 | 45 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .966 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 8 | 20 | 1 |
| 1987 | Phoenix | PCL | AAA | 30 | 52 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .966 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 10 | 18 | 1 |
| | SF Giants | NL | MLB | 30 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .750 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 2 | 1 | 1 |
| 1988 | Williamsport | East | AA | 31 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.000 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0 | 1 | 0 |
| | Colorado Springs | PCL | AAA | 31 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .933 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 2 | 12 | 1 |
| | Cleveland | AL | MLB | 31 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.000 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1 | 7 | 0 |
Minor League Totals | 311 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .928 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 124 | 263 | 30 |