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| 1981 | San Jose | Calif | A+ | 20 | 0 | 40 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | -- | .978 | -- | -- | -- | -- | -- | -- | -- | .800 | 234 | 42 | 8 |
| 1982 | West Haven | East | AA | 21 | 0 | 114 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .989 | -- | -- | -- | -- | -- | -- | -- | -- | 763 | 55 | 9 |
| 1983 | Tacoma | PCL | AAA | 22 | 0 | 107 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .979 | 1.000 | -- | -- | -- | -- | -- | -- | -- | 633 | 55 | 15 |
| 1984 | Tacoma | PCL | AAA | 23 | 0 | 69 | 1 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .983 | 1.000 | -- | 1.000 | -- | -- | -- | -- | -- | 381 | 29 | 7 |
| 1985 | Tacoma | PCL | AAA | 24 | 0 | 97 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .990 | -- | -- | -- | -- | -- | -- | -- | -- | 613 | 64 | 7 |
| 1986 | Tacoma | PCL | AAA | 25 | 0 | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .986 | -- | -- | -- | -- | -- | -- | -- | -- | 120 | 21 | 2 |
| | Oakland | AL | MLB | 25 | 0 | 39 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .991 | -- | -- | -- | -- | -- | -- | -- | -- | 211 | 11 | 2 |
| 1987 | Iowa | Amer | AAA | 26 | 0 | 24 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .980 | .975 | -- | -- | -- | -- | -- | -- | -- | 176 | 10 | 4 |
| 1988 | Iowa | Amer | AAA | 27 | 0 | 73 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | .984 | .962 | -- | -- | -- | -- | -- | -- | -- | 434 | 33 | 8 |
| 1989 | Phoenix | PCL | AAA | 28 | 0 | 18 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | -- | .992 | 1.000 | -- | -- | -- | -- | -- | -- | 1.000 | 145 | 11 | 1 |
| | SF Giants | NL | MLB | 28 | 0 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 1.000 | -- | -- | -- | -- | -- | -- | -- | -- | 13 | 0 | 0 |
| 1990 | SF Giants | NL | MLB | 29 | 0 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | 1.000 | -- | -- | -- | -- | -- | -- | -- | -- | 10 | 1 | 0 |
Minor League Totals | 0 | 568 | 17 | 0 | 4 | 0 | 0 | 0 | 0 | 10 | 0 | -- | .985 | .978 | -- | 1.000 | -- | -- | -- | -- | .900 | 3499 | 320 | 61 |