| Year | Team | W | L | G | IP | ERA | WHIP | K | BB | HR | K/9 | BB/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1989 | Texas Rangers | 0 | 1 | 1 | 0.0 | — | — | 0 | 2 | 2 | — | — |
| 1991 |
| Chicago White Sox |
| 3 |
| 2 |
| 10 |
| 56.1 |
| 3.51 |
| 1.35 |
| 32 |
| 29 |
| 9 |
| 5.11 |
| 4.63 |
| 1992 | Chicago White Sox | 5 | 3 | 34 | 100.1 | 5.20 | 1.67 | 66 | 65 | 12 | 5.92 | 5.83 |
| 1993 | Chicago White Sox | 15 | 8 | 31 | 207.2 | 2.95 | 1.40 | 155 | 122 | 14 | 6.72 | 5.29 |
| 1994 | Chicago White Sox | 12 | 8 | 24 | 161.2 | 3.45 | 1.29 | 108 | 62 | 16 | 6.01 | 3.45 |
| 1995 | Chicago White Sox | 8 | 11 | 29 | 175.0 | 4.32 | 1.51 | 118 | 93 | 21 | 6.07 | 4.78 |
| 1996 | Chicago White Sox | 15 | 10 | 35 | 217.1 | 4.22 | 1.44 | 181 | 97 | 21 | 7.50 | 4.02 |
| 1997 | Chicago White Sox | 9 | 8 | 22 | 145.2 | 3.03 | 1.24 | 110 | 55 | 9 | 6.80 | 3.40 |
| 1997 | San Francisco Giants | 4 | 3 | 11 | 66.1 | 4.48 | 1.36 | 69 | 36 | 9 | 9.36 | 4.88 |
| 1997 | 13 | 11 | 33 | 212.0 | 3.48 | 1.28 | 179 | 91 | 18 | 7.60 | 3.86 |
| 1998 | Tampa Bay Devil Rays | 6 | 14 | 25 | 142.2 | 4.73 | 1.39 | 107 | 68 | 18 | 6.75 | 4.29 |
| 1999 | Tampa Bay Devil Rays | 9 | 9 | 28 | 160.0 | 4.22 | 1.49 | 128 | 79 | 22 | 7.20 | 4.44 |
| 2002 | Tampa Bay Devil Rays | 2 | 3 | 23 | 75.0 | 5.28 | 1.55 | 56 | 36 | 13 | 6.72 | 4.32 |
| 2003 | Los Angeles Dodgers | 6 | 2 | 21 | 95.0 | 2.37 | 1.08 | 82 | 23 | 5 | 7.77 | 2.18 |
| 2004 | Los Angeles Dodgers | 7 | 6 | 40 | 120.2 | 4.03 | 1.16 | 102 | 31 | 12 | 7.61 | 2.31 |
| 2005 | Los Angeles Dodgers | 1 | 4 | 21 | 24.0 | 5.63 | 1.58 | 16 | 7 | 7 | 6.00 | 2.63 |
| Career | — | 102 | 92 | 355 | 1747.2 | 3.96 | 1.39 | 1,330 | 805 | 190 | 6.85 | 4.15 |
