Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1968 | CAL | 15 | 15 | 5 | 6 | 2.17 | 56 | 3 | 0 | 0 | 99.1 | 67 | 24 | 30 | 5 | 28 | 5 | 0.96 |
| 1969 | CAL | 36 | 35 | 10 | 16 | 4.21 | 100 | 4 | 0 | 0 | 215.2 | 213 | 101 | 110 | 12 | 69 | 21 | 1.31 |
| 1970 | CAL | 39 | 38 | 16 | 13 | 4.24 | 99 | 5 | 2 | 0 | 227.0 | 223 | 107 | 114 | 32 | 81 | 7 | 1.34 |
| 1971 | CAL | 37 | 36 | 6 | 17 | 3.77 | 89 | 7 | 0 | 0 | 243.1 | 228 | 102 | 108 | 24 | 82 | 9 | 1.27 |
| 1972 | CAL | 6 | 0 | 0 | 0 | 5.40 | 2 | 0 | 0 | 0 | 10.0 | 13 | 6 | 6 | 0 | 8 | 0 | 2.10 |
| 1972 | KCR | 18 | 9 | 4 | 4 | 3.07 | 34 | 1 | 1 | 1 | 70.1 | 77 | 24 | 26 | 3 | 16 | 6 | 1.32 |
| 1972 | TOT | 24 | 9 | 4 | 4 | 3.36 | 36 | 1 | 1 | 1 | 80.1 | 90 | 30 | 32 | 3 | 24 | 6 | 1.42 |
| 1973 | STL | 19 | 13 | 3 | 7 | 3.76 | 42 | 2 | 0 | 0 | 88.2 | 89 | 37 | 38 | 5 | 22 | 3 | 1.25 |
| 1974 | MIL | 70 | 0 | 10 | 10 | 1.90 | 47 | 0 | 0 | 20 | 123.0 | 97 | 26 | 27 | 6 | 51 | 2 | 1.20 |
| 1975 | MIL | 52 | 0 | 1 | 9 | 4.60 | 32 | 0 | 0 | 20 | 72.1 | 85 | 37 | 43 | 5 | 27 | 5 | 1.55 |
| 1976 | MIL | 15 | 0 | 0 | 1 | 7.36 | 7 | 0 | 0 | 1 | 18.1 | 25 | 15 | 18 | 2 | 9 | 2 | 1.85 |
| 1976 | BOS | 37 | 0 | 4 | 5 | 3.44 | 32 | 0 | 0 | 8 | 81.0 | 91 | 31 | 43 | 5 | 25 | 2 | 1.43 |
| 1976 | TOT | 52 | 0 | 4 | 6 | 4.17 | 39 | 0 | 0 | 9 | 99.1 | 116 | 46 | 61 | 7 | 34 | 4 | 1.51 |
| 1977 | BOS | 16 | 0 | 0 | 1 | 6.75 | 13 | 0 | 0 | 0 | 30.2 | 44 | 23 | 25 | 6 | 12 | 0 | 1.83 |
| 1977 | TOR | 19 | 1 | 2 | 1 | 3.63 | 26 | 0 | 0 | 2 | 52.0 | 63 | 21 | 22 | 6 | 18 | 1 | 1.56 |
| 1977 | TOT | 35 | 1 | 2 | 2 | 4.79 | 39 | 0 | 0 | 2 | 82.2 | 107 | 44 | 47 | 12 | 30 | 1 | 1.66 |
| 1978 | TOR | 50 | 0 | 6 | 9 | 3.93 | 36 | 0 | 0 | 7 | 94.0 | 87 | 41 | 43 | 11 | 37 | 0 | 1.32 |
| 1979 | TOR | 10 | 0 | 1 | 2 | 5.40 | 6 | 0 | 0 | 0 | 18.1 | 23 | 11 | 11 | 1 | 8 | 0 | 1.69 |
| Career | 439 | 147 | 68 | 101 | 3.78 | 621 | 22 | 3 | 59 | 1444.0 | 1,425 | 606 | 664 | 123 | 493 | 63 | 1.33 |
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