Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1966 | KCA | 14 | 14 | 4 | 6 | 4.09 | 61 | 1 | 0 | 0 | 83.2 | 71 | 38 | 41 | 7 | 50 | 2 | 1.45 |
| 1967 | KCA | 32 | 29 | 10 | 10 | 3.69 | 110 | 4 | 1 | 0 | 197.2 | 172 | 81 | 83 | 17 | 75 | 3 | 1.25 |
| 1968 | OAK | 35 | 34 | 12 | 14 | 3.00 | 168 | 11 | 3 | 0 | 225.1 | 197 | 75 | 91 | 20 | 80 | 4 | 1.23 |
| 1969 | OAK | 35 | 35 | 15 | 13 | 3.86 | 137 | 11 | 1 | 0 | 235.1 | 244 | 101 | 111 | 16 | 80 | 1 | 1.38 |
| 1970 | OAK | 41 | 40 | 16 | 15 | 3.74 | 149 | 13 | 5 | 0 | 267.0 | 230 | 111 | 122 | 32 | 92 | 5 | 1.21 |
| 1971 | OAK | 30 | 30 | 15 | 5 | 3.81 | 100 | 7 | 1 | 0 | 189.0 | 185 | 80 | 84 | 24 | 71 | 1 | 1.35 |
| 1973 | OAK | 1 | 1 | 0 | 1 | 7.71 | 3 | 0 | 0 | 0 | 2.1 | 6 | 2 | 4 | 1 | 2 | 0 | 3.43 |
| 1974 | CAL | 5 | 5 | 2 | 3 | 5.70 | 16 | 2 | 0 | 0 | 30.0 | 39 | 19 | 19 | 3 | 13 | 0 | 1.73 |
| 1975 | CAL | 9 | 2 | 0 | 2 | 6.75 | 14 | 0 | 0 | 0 | 28.0 | 30 | 21 | 26 | 5 | 13 | 2 | 1.54 |
| Career | 202 | 190 | 74 | 69 | 3.78 | 758 | 49 | 11 | 0 | 1258.1 | 1,174 | 528 | 581 | 125 | 476 | 18 | 1.31 |
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