| Year | Tm | G | W | L | Sv | IP | K | ERA | WHIP | R$ | T15 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1980 | BOS | 30 | 12 | 14 | 0 | 197 | 121 | 4.28 | 1.17 | $10 | |
| 1981 | BOS | 23 | 9 | 8 | 0 | 154 | 79 | 4.27 | 1.27 | $6 | |
| 1982 | BOS | 33 | 13 | 13 | 0 | 224 | 127 | 3.73 | 1.21 | $14 | |
| 1983 | BOS | 28 | 9 | 13 | 0 | 176 | 77 | 5.61 | 1.49 | -$4 | |
| 1984 | BOS-CHC | 33 | 14 | 12 | 0 | 225 | 114 | 3.60 | 1.21 | $14 | |
| 1985 | CHC | 25 | 11 | 7 | 0 | 169 | 117 | 3.08 | 0.97 | $17 | |
| 1986 | CHC | 33 | 6 | 11 | 0 | 201 | 137 | 4.57 | 1.34 | $5 | |
| 1987 | OAK | 54 | 6 | 8 | 16 | 115 | 113 | 3.03 | 1.00 | $19 | |
| 1988 | OAK | 60 | 4 | 2 | 45 | 72 | 70 | 2.35 | 0.87 | $25 | T15 |
| 1989 | OAK | 51 | 4 | 0 | 33 | 57 | 55 | 1.56 | 0.61 | $20 | |
| 1990 | OAK | 63 | 4 | 2 | 48 | 73 | 73 | 0.61 | 0.61 | $32 | T15 |
| 1991 | OAK | 67 | 5 | 4 | 43 | 76 | 87 | 2.96 | 0.91 | $24 | T15 |
| 1992 | OAK | 69 | 7 | 1 | 51 | 80 | 93 | 1.91 | 0.91 | $30 | T15 |
| 1993 | OAK | 64 | 2 | 4 | 36 | 67 | 80 | 4.16 | 1.19 | $16 | |
| 1994 | OAK | 45 | 5 | 4 | 19 | 44 | 47 | 4.26 | 1.40 | $13 | |
| 1995 | OAK | 52 | 4 | 6 | 29 | 50 | 40 | 4.83 | 1.27 | $13 | |
| 1996 | STL | 63 | 0 | 6 | 30 | 60 | 49 | 3.30 | 1.18 | $13 | |
| 1997 | STL | 57 | 1 | 5 | 36 | 53 | 45 | 3.91 | 1.08 | $14 | |
| 1998 | BOS | 50 | 4 | 1 | 1 | 39 | 22 | 4.76 | 1.36 | -$1 |