| Year | Team | G | GS | W | L | SV | CG | SHO | IP | H | R | ER | HR | BB | K | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1997 | 15 | 15 | 5 | 3 | 0 | 0 | 0 | 73.2 | 101 | 50 | 37 | 6 | 21 | 72 | 4.52 | 1.66 | |
| 1998 | 18 | 18 | 10 | 5 | 0 | 1 | 0 | 117.1 | 119 | 50 | 46 | 7 | 15 | 74 | 3.53 | 1.14 | |
| 1999 | 14 | 4 | 8 | 1 | 0 | 0 | 0 | 48 | 25 | 7 | 6 | 0 | 11 | 45 | 1.13 | .750 | |
| 2000 | Royals | 20 | 0 | 0 | 1 | 0 | 0 | 0 | 34.1 | 38 | 16 | 16 | 3 | 11 | 17 | 4.19 | 1.43 |
| 2000 | 21 | 15 | 7 | 3 | 0 | 1 | 0 | 102.2 | 99 | 52 | 40 | 12 | 21 | 69 | 3.51 | 1.17 | |
| 2001 | Royals | 29 | 15 | 6 | 5 | 1 | 0 | 0 | 109.1 | 132 | 78 | 63 | 26 | 32 | 67 | 5.19 | 1.50 |
| 2001 | 6 | 5 | 2 | 2 | 0 | 0 | 0 | 29 | 31 | 9 | 9 | 2 | 6 | 18 | 2.79 | 1.28 | |
| 2002 | Royals | 12 | 0 | 2 | 0 | 0 | 0 | 0 | 18.2 | 29 | 18 | 17 | 7 | 5 | 10 | 8.20 | 1.82 |
| 2002 | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 8 | 3 | 0 | 0 | 0 | 1 | 10 | 0.00 | .500 | |
| 2003 | Royals | 29 | 4 | 6 | 3 | 0 | 0 | 0 | 72.2 | 92 | 49 | 43 | 13 | 16 | 42 | 5.33 | 1.49 |
| 2003 | 5 | 0 | 0 | 2 | 0 | 0 | 0 | 12.1 | 21 | 12 | 11 | 2 | 3 | 9 | 8.03 | 1.95 | |
| 2004 | 28 | 28 | 10 | 13 | 0 | 0 | 0 | 167.1 | 201 | 116 | 105 | 39 | 28 | 97 | 5.65 | 1.37 | |
| 2005 | 29 | 7 | 4 | 1 | 0 | 0 | 0 | 67.1 | 78 | 39 | 32 | 8 | 17 | 52 | 4.28 | 1.41 | |
| 2006 | Yankees | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 8.1 | 14 | 8 | 8 | 4 | 4 | 6 | 8.64 | 2.16 |
| 2006 | 2 | 2 | 0 | 2 | 0 | 0 | 0 | 8.2 | 13 | 10 | 9 | 4 | 2 | 2 | 9.35 | 1.73 | |
| Career Total | 95 | 20 | 14 | 9 | 1 | 0 | 0 | 243.1 | 305 | 169 | 147 | 53 | 68 | 142 | 5.44 | 1.53 | |
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