| Year | Team | W | L | G | IP | ERA | WHIP | K | BB | HR | K/9 | BB/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1982 | Toronto Blue Jays | 5 | 10 | 30 | 136.0 | 4.43 | 1.47 | 82 | 66 | 15 | 5.43 | 4.37 |
| 1983 |
| Toronto Blue Jays |
| 9 |
| 14 |
| 34 |
| 176.2 |
| 4.74 |
| 1.49 |
| 121 |
| 68 |
| 15 |
| 6.16 |
| 3.46 |
| 1984 | Toronto Blue Jays | 7 | 6 | 35 | 109.2 | 4.02 | 1.29 | 73 | 49 | 7 | 5.99 | 4.02 |
| 1985 | San Francisco Giants | 7 | 10 | 26 | 148.1 | 3.88 | 1.31 | 78 | 51 | 10 | 4.73 | 3.09 |
| 1986 | San Francisco Giants | 0 | 0 | 9 | 13.0 | 7.62 | 2.23 | 9 | 13 | 0 | 6.23 | 9.00 |
| 1987 | San Francisco Giants | 1 | 0 | 30 | 56.0 | 4.50 | 1.52 | 63 | 32 | 4 | 10.13 | 5.14 |
| 1987 | Pittsburgh Pirates | 0 | 2 | 25 | 31.0 | 1.45 | 1.16 | 27 | 8 | 0 | 7.84 | 2.32 |
| 1987 | 1 | 2 | 55 | 87.0 | 3.41 | 1.39 | 90 | 40 | 4 | 9.31 | 4.14 |
| 1988 | Pittsburgh Pirates | 6 | 6 | 67 | 77.1 | 3.49 | 1.16 | 76 | 22 | 9 | 8.84 | 2.56 |
| 1989 | Pittsburgh Pirates | 0 | 0 | 1 | 0.2 | 0.00 | 3.00 | 1 | 1 | 0 | 13.50 | 13.50 |
| 1990 | Los Angeles Dodgers | 3 | 5 | 50 | 62.0 | 2.90 | 1.50 | 44 | 34 | 5 | 6.39 | 4.94 |
| 1991 | Los Angeles Dodgers | 4 | 3 | 55 | 76.0 | 2.96 | 1.25 | 73 | 32 | 5 | 8.64 | 3.79 |
| 1992 | Los Angeles Dodgers | 3 | 3 | 68 | 88.0 | 2.45 | 1.28 | 75 | 41 | 4 | 7.67 | 4.19 |
| 1993 | Los Angeles Dodgers | 4 | 8 | 62 | 77.2 | 2.32 | 1.13 | 67 | 17 | 6 | 7.76 | 1.97 |
| 1994 | Los Angeles Dodgers | 5 | 3 | 37 | 36.1 | 5.94 | 1.82 | 29 | 20 | 3 | 7.18 | 4.95 |
| 1995 | Pittsburgh Pirates | 2 | 4 | 25 | 31.1 | 6.03 | 1.60 | 19 | 12 | 2 | 5.46 | 3.45 |
| Career | — | 56 | 74 | 554 | 1120.0 | 3.87 | 1.38 | 837 | 466 | 85 | 6.73 | 3.74 |
