| 1978 | Bristol | East | 20 | BOS | AA | P | 6 | | | 0 | 2 | 0 | 2 | 0 | - | - | - | 1.000 | -- |
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| 1979 | Winter Hvn | FSL | 21 | BOS | A+ | P | 12 | | | 3 | 17 | 1 | 21 | 4 | - | - | - | 952 | -- |
| | Bristol | East | 21 | BOS | AA | P | 16 | | | 2 | 17 | 1 | 20 | 0 | - | - | - | 950 | -- |
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| 1980 | Boston | AL | 22 | BOS | MLB | P | 12 | | 30.2 | 1 | 4 | 0 | 5 | 0 | - | - | - | 1.000 | 1.47 |
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| 1981 | Pawtucket | IL | 23 | BOS | AAA | P | 31 | | | 12 | 31 | 1 | 44 | 1 | - | - | - | 977 | -- |
| | Boston | AL | 23 | BOS | MLB | P | 5 | | 23 | 0 | 2 | 0 | 2 | 0 | - | - | - | 1.000 | 0.78 |
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| 1982 | Boston | AL | 24 | BOS | MLB | P | 28 | | 117 | 6 | 22 | 1 | 29 | 1 | - | - | - | 966 | 2.15 |
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| 1983 | Boston | AL | 25 | BOS | MLB | P | 33 | | 211.1 | 12 | 34 | 2 | 48 | 2 | - | - | - | 958 | 1.96 |
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| 1984 | Boston | AL | 26 | BOS | MLB | P | 33 | | 218 | 10 | 30 | 0 | 40 | 1 | - | - | - | 1.000 | 1.65 |
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| 1985 | Boston | AL | 27 | BOS | MLB | P | 35 | | 229.1 | 11 | 32 | 3 | 46 | 0 | - | - | - | 935 | 1.69 |
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| 1986 | Boston | AL | 28 | BOS | MLB | P | 25 | | 174.1 | 7 | 18 | 2 | 27 | 2 | - | - | - | 926 | 1.29 |
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| 1987 | Boston | AL | 29 | BOS | MLB | P | 33 | | 238.2 | 12 | 34 | 3 | 49 | 2 | - | - | - | 939 | 1.73 |
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| 1988 | Boston | AL | 30 | BOS | MLB | P | 33 | | 216.2 | 7 | 31 | 0 | 38 | 0 | - | - | - | 1.000 | 1.58 |
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| 1989 | San Diego | NL | 31 | SD | MLB | P | 33 | | 244.2 | 8 | 42 | 0 | 50 | 2 | - | - | - | 1.000 | 1.84 |
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| 1990 | San Diego | NL | 32 | SD | MLB | P | 33 | | 223.2 | 7 | 34 | 1 | 42 | 3 | - | - | - | 976 | 1.65 |
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| 1991 | San Diego | NL | 33 | SD | MLB | P | 31 | | 221.2 | 7 | 33 | 2 | 42 | 2 | - | - | - | 952 | 1.62 |
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| 1992 | San Diego | NL | 34 | SD | MLB | P | 32 | | 217.1 | 10 | 32 | 1 | 43 | 0 | - | - | - | 977 | 1.74 |
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| 1993 | Rancho Cuc | Calif | 35 | SD | A+ | P | 1 | | | 0 | 1 | 0 | 1 | 0 | - | - | - | 1.000 | -- |
| | Las Vegas & Colorado Springs | PCL | 35 | SD/COL | AAA | P | 4 | | | 1 | 5 | 2 | 8 | 0 | - | - | - | 750 | -- |
| | Colorado | NL | 35 | COL | MLB | P | 3 | | 8.2 | 0 | 3 | 0 | 3 | 0 | - | - | - | 1.000 | 3.12 |
| | San Diego | NL | 35 | SD | MLB | P | 2 | | 4.1 | 0 | 1 | 0 | 1 | 0 | - | - | - | 1.000 | 2.08 |
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| 1994 | Charlotte | FSL | 36 | TEX | A+ | P | 2 | | | 0 | 1 | 0 | 1 | 0 | - | - | - | 1.000 | -- |
| | Texas | AL | 36 | TEX | MLB | P | 8 | | 38 | 0 | 3 | 0 | 3 | 0 | - | - | - | 1.000 | 0.71 |