Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1963 | BOS | 29 | 29 | 10 | 13 | 3.81 | 136 | 6 | 1 | 0 | 174.2 | 137 | 74 | 82 | 20 | 99 | 0 | 1.35 |
| 1964 | BOS | 32 | 30 | 8 | 15 | 4.97 | 139 | 3 | 1 | 0 | 166.2 | 156 | 92 | 101 | 14 | 112 | 4 | 1.61 |
| 1965 | BOS | 34 | 33 | 10 | 18 | 4.06 | 163 | 5 | 2 | 0 | 192.2 | 157 | 87 | 103 | 18 | 113 | 3 | 1.40 |
| 1966 | BOS | 12 | 5 | 1 | 2 | 5.46 | 20 | 0 | 0 | 0 | 28.0 | 31 | 17 | 17 | 7 | 7 | 0 | 1.36 |
| 1967 | BOS | 10 | 9 | 5 | 4 | 4.34 | 40 | 1 | 1 | 0 | 47.2 | 48 | 23 | 24 | 0 | 22 | 2 | 1.47 |
| 1968 | BOS | 11 | 9 | 1 | 4 | 2.45 | 28 | 3 | 1 | 0 | 55.0 | 52 | 15 | 17 | 3 | 20 | 2 | 1.31 |
| 1969 | KCR | 21 | 2 | 2 | 3 | 5.73 | 32 | 0 | 0 | 0 | 33.0 | 28 | 21 | 22 | 7 | 28 | 0 | 1.70 |
| 1970 | KCR | 28 | 17 | 3 | 5 | 3.62 | 69 | 1 | 0 | 1 | 121.2 | 121 | 49 | 64 | 9 | 62 | 1 | 1.50 |
| Career | 177 | 134 | 40 | 64 | 4.15 | 627 | 19 | 6 | 1 | 819.1 | 730 | 378 | 430 | 78 | 463 | 12 | 1.46 |
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