| Year | Team | W | L | G | IP | ERA | WHIP | K | BB | HR | K/9 | BB/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1981 | Texas Rangers | 0 | 1 | 14 | 31.2 | 3.13 | 1.33 | 13 | 11 | 1 | 3.69 | 3.13 |
| 1982 |
| Texas Rangers |
| 4 |
| 6 |
| 33 |
| 109.2 |
| 3.20 |
| 1.30 |
| 69 |
| 25 |
| 5 |
| 5.66 |
| 2.05 |
| 1983 | Texas Rangers | 3 | 3 | 31 | 46.1 | 3.88 | 1.21 | 29 | 14 | 3 | 5.63 | 2.72 |
| 1984 | Texas Rangers | 6 | 6 | 43 | 70.1 | 2.56 | 1.27 | 46 | 20 | 3 | 5.89 | 2.56 |
| 1985 | Texas Rangers | 7 | 6 | 51 | 85.2 | 3.15 | 1.20 | 46 | 22 | 6 | 4.83 | 2.31 |
| 1986 | Chicago White Sox | 3 | 6 | 49 | 92.1 | 3.31 | 1.31 | 67 | 27 | 10 | 6.53 | 2.63 |
| 1987 | Baltimore Orioles | 10 | 5 | 35 | 124.0 | 3.77 | 1.24 | 70 | 26 | 13 | 5.08 | 1.89 |
| 1988 | Baltimore Orioles | 8 | 5 | 41 | 129.2 | 3.40 | 1.29 | 67 | 38 | 14 | 4.65 | 2.64 |
| 1989 | Baltimore Orioles | 10 | 13 | 38 | 156.2 | 5.69 | 1.48 | 46 | 36 | 24 | 2.64 | 2.07 |
| 1990 | Montreal Expos | 3 | 3 | 34 | 48.0 | 4.31 | 1.48 | 22 | 13 | 3 | 4.13 | 2.44 |
| 1991 | Montreal Expos | 0 | 1 | 4 | 4.1 | 10.38 | 2.54 | 3 | 2 | 2 | 6.23 | 4.15 |
| 1992 | Seattle Mariners | 0 | 0 | 3 | 3.1 | 18.90 | 3.00 | 1 | 3 | 1 | 2.70 | 8.10 |
| Career | — | 54 | 55 | 376 | 902.0 | 3.88 | 1.33 | 479 | 237 | 85 | 4.78 | 2.36 |
