| 1983 | GCL Pirates | GCL | Rk | 19 | 0 | 0 | 0 | 40 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .959 | -- | 1.000 | -- | -- | -- | -- | 102 | 125 | 9 |
| 1984 | Macon | SAL | A | 20 | 0 | 0 | 0 | 79 | 0 | 44 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .977 | -- | .894 | -- | -- | -- | -- | 271 | 306 | 32 |
| 1985 | Prince William | Caro | A+ | 21 | 36 | 0 | 0 | 54 | 22 | 25 | 0 | 0 | 0 | 2 | 0 | 1.000 | -- | -- | .987 | .846 | .972 | -- | -- | -- | 1.000 | 177 | 240 | 14 |
| 1986 | Nashua | East | AA | 22 | 15 | 0 | 0 | 130 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.000 | -- | -- | .982 | -- | -- | -- | -- | -- | -- | 322 | 386 | 13 |
| 1987 | Vancouver | PCL | AAA | 23 | 0 | 0 | 0 | 128 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .973 | -- | -- | -- | -- | -- | -- | 311 | 432 | 21 |
| | Pittsburgh | NL | MLB | 23 | 0 | 0 | 0 | 35 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .995 | -- | -- | -- | -- | -- | -- | 53 | 139 | 1 |
| 1988 | Pittsburgh | NL | MLB | 24 | 0 | 0 | 0 | 153 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .987 | -- | -- | -- | -- | -- | -- | 333 | 473 | 11 |
| 1989 | Pittsburgh | NL | MLB | 25 | 0 | 0 | 0 | 151 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .976 | -- | -- | -- | -- | -- | -- | 309 | 438 | 18 |
| 1990 | Pittsburgh | NL | MLB | 26 | 0 | 0 | 0 | 152 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .991 | -- | -- | -- | -- | -- | -- | 330 | 449 | 7 |
| 1991 | Pittsburgh | NL | MLB | 27 | 0 | 0 | 0 | 149 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .989 | -- | -- | -- | -- | -- | -- | 349 | 438 | 9 |
| 1992 | Pittsburgh | NL | MLB | 28 | 0 | 0 | 0 | 134 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .992 | -- | -- | -- | -- | -- | -- | 311 | 428 | 6 |
| 1993 | KC Royals | AL | MLB | 29 | 0 | 0 | 0 | 136 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .994 | -- | -- | -- | -- | -- | -- | 269 | 362 | 4 |
| 1994 | KC Royals | AL | MLB | 30 | 0 | 0 | 0 | 84 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | -- | -- | -- | .988 | -- | -- | -- | -- | -- | -- | 149 | 252 | 5 |
| 1995 | Vancouver | PCL | AAA | 31 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | 1.000 | -- | -- | -- | -- | -- | -- | 23 | 21 | 0 |
| | KC Royals | AL | MLB | 31 | 0 | 0 | 0 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | .992 | -- | -- | -- | -- | -- | -- | 56 | 75 | 1 |
| | California | AL | MLB | 31 | 0 | 0 | 0 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | -- | 1.000 | -- | -- | -- | -- | -- | -- | 24 | 40 | 0 |
Minor League Totals | 51 | 0 | 0 | 441 | 22 | 73 | 0 | 0 | 0 | 2 | 0 | 1.000 | -- | -- | .977 | .846 | .923 | -- | -- | -- | 1.000 | 1206 | 1510 | 89 |