| Year | Tm | G | W | L | Sv | IP | K | ERA | WHIP | R$ | T15 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1980 | DET | 36 | 16 | 15 | 0 | 250 | 112 | 4.18 | 1.36 | $9 | |
| 1981 | DET | 25 | 14 | 7 | 0 | 198 | 97 | 3.05 | 1.17 | $22 | T15 |
| 1982 | DET | 37 | 17 | 16 | 0 | 266 | 135 | 4.06 | 1.29 | $12 | |
| 1983 | DET | 37 | 20 | 13 | 0 | 293 | 232 | 3.34 | 1.16 | $28 | T15 |
| 1984 | DET | 35 | 19 | 11 | 0 | 240 | 148 | 3.60 | 1.28 | $15 | |
| 1985 | DET | 35 | 16 | 11 | 0 | 257 | 191 | 3.33 | 1.25 | $19 | |
| 1986 | DET | 35 | 21 | 8 | 0 | 267 | 223 | 3.27 | 1.17 | $24 | T15 |
| 1987 | DET | 34 | 18 | 11 | 0 | 266 | 208 | 3.38 | 1.20 | $24 | T15 |
| 1988 | DET | 34 | 15 | 13 | 0 | 235 | 168 | 3.94 | 1.31 | $11 | |
| 1989 | DET | 24 | 6 | 14 | 0 | 170 | 115 | 4.86 | 1.46 | $0 | |
| 1990 | DET | 36 | 15 | 18 | 0 | 249 | 162 | 4.51 | 1.31 | $9 | |
| 1991 | MIN | 35 | 18 | 12 | 0 | 246 | 163 | 3.43 | 1.29 | $16 | |
| 1992 | TOR | 34 | 21 | 6 | 0 | 240 | 132 | 4.04 | 1.26 | $13 | |
| 1993 | TOR | 27 | 7 | 12 | 0 | 152 | 103 | 6.19 | 1.66 | -$7 | |
| 1994 | CLE | 23 | 10 | 6 | 0 | 141 | 100 | 5.60 | 1.63 | $1 |