| 1985 | GCL Astros | GCL | Rk | 18 | 0 | 0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | .975 | -- | -- | -- | -- | -- | -- | -- | 186 | 7 | 5 |
| 1986 | GCL Astros | GCL | Rk | 19 | 0 | 0 | 50 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | .985 | -- | -- | -- | -- | -- | -- | -- | 433 | 28 | 7 |
| 1987 | Asheville | SAL | A | 20 | 0 | 0 | 124 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | .984 | -- | 1.000 | -- | -- | -- | -- | -- | 1089 | 47 | 19 |
| 1988 | Osceola | FSL | A+ | 21 | 0 | 0 | 122 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | .982 | -- | -- | -- | -- | -- | -- | -- | 1143 | 41 | 22 |
| 1989 | Columbus | Sou | AA | 22 | 0 | 0 | 109 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | .990 | -- | -- | -- | -- | -- | -- | -- | 938 | 44 | 10 |
| 1990 | Tucson | PCL | AAA | 23 | 0 | 0 | 117 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | -- | -- | .983 | -- | 1.000 | -- | -- | -- | -- | 1.000 | 1013 | 75 | 19 |
| | Houston | NL | MLB | 23 | 0 | 0 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | 1.000 | -- | -- | -- | -- | -- | -- | -- | 20 | 1 | 0 |
| 1991 | Tucson | PCL | AAA | 24 | 0 | 0 | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 48 | 0 | -- | -- | .971 | -- | -- | -- | -- | -- | -- | .977 | 325 | 25 | 10 |
| | Houston | NL | MLB | 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 41 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | .889 | 44 | 4 | 6 |
| 1992 | Tucson | PCL | AAA | 25 | 0 | 0 | 45 | 0 | 0 | 0 | 0 | 0 | 0 | 73 | 0 | -- | -- | .983 | -- | -- | -- | -- | -- | -- | .963 | 476 | 29 | 11 |
| | Houston | NL | MLB | 25 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 0 | -- | -- | 1.000 | -- | -- | -- | -- | -- | -- | 1.000 | 10 | 2 | 0 |
| 1993 | Las Vegas | PCL | AAA | 26 | 0 | 0 | 92 | 0 | 2 | 0 | 0 | 0 | 0 | 10 | 0 | -- | -- | .987 | -- | 1.000 | -- | -- | -- | -- | .857 | 774 | 46 | 13 |
| 1994 | Buffalo | Amer | AAA | 27 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1.000 | 26 | 0 | 0 |
| | Tucson | PCL | AAA | 27 | 0 | 0 | 56 | 0 | 4 | 0 | 0 | 0 | 0 | 34 | 0 | -- | -- | .992 | -- | .786 | -- | -- | -- | -- | .962 | 555 | 32 | 9 |
| | Houston | NL | MLB | 27 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | .857 | 6 | 0 | 1 |
| 1995 | Tucson | PCL | AAA | 28 | 0 | 0 | 48 | 0 | 0 | 0 | 0 | 0 | 0 | 34 | 0 | -- | -- | .985 | -- | -- | -- | -- | -- | -- | .964 | 424 | 30 | 8 |
| | Houston | NL | MLB | 28 | 0 | 0 | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | 0 | -- | -- | .995 | -- | -- | -- | -- | -- | -- | 1.000 | 221 | 17 | 1 |
| 1996 | Tucson | PCL | AAA | 29 | 0 | 0 | 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | -- | -- | .967 | -- | -- | -- | -- | -- | -- | -- | 138 | 9 | 5 |
| | Houston | NL | MLB | 29 | 0 | 0 | 5 | 0 | 0 | 0 | 9 | 0 | 3 | 0 | 0 | -- | -- | 1.000 | -- | -- | -- | 1.000 | -- | 1.000 | -- | 24 | 1 | 0 |
| 1997 | Oklahoma City | Amer | AAA | 30 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1.000 | 17 | 1 | 0 |
| | Texas | AL | MLB | 30 | 0 | 0 | 2 | 0 | 0 | 0 | 2 | 0 | 17 | 0 | 28 | -- | -- | .933 | -- | -- | -- | 1.000 | -- | .957 | -- | 36 | 1 | 2 |
| 1998 | Texas | AL | MLB | 31 | 0 | 0 | 16 | 0 | 0 | 0 | 3 | 0 | 40 | 0 | 26 | -- | -- | .976 | -- | -- | -- | 1.000 | -- | 1.000 | -- | 118 | 8 | 2 |
| 1999 | Oklahoma | PCL | AAA | 32 | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | -- | -- | .969 | -- | -- | -- | -- | -- | -- | 1.000 | 35 | 2 | 1 |
| | Texas | AL | MLB | 32 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | -- | -- | 1.000 | -- | -- | -- | -- | -- | -- | -- | 0 | 1 | 0 |
Minor League Totals | 0 | 0 | 836 | 0 | 8 | 0 | 0 | 0 | 0 | 230 | 0 | -- | -- | .984 | -- | .850 | -- | -- | -- | -- | .967 | 7572 | 416 | 139 |