Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1964 | HOU | 3 | 1 | 0 | 1 | 2.00 | 5 | 0 | 0 | 0 | 9.0 | 7 | 2 | 4 | 1 | 3 | 0 | 1.11 |
1965 | HOU | 26 | 19 | 7 | 8 | 3.50 | 109 | 1 | 0 | 0 | 146.2 | 135 | 57 | 69 | 16 | 37 | 3 | 1.17 |
1966 | HOU | 29 | 28 | 10 | 8 | 3.18 | 108 | 8 | 2 | 0 | 187.0 | 173 | 66 | 73 | 17 | 45 | 1 | 1.17 |
1967 | HOU | 15 | 15 | 6 | 5 | 3.36 | 68 | 4 | 0 | 0 | 99.0 | 95 | 37 | 44 | 4 | 25 | 1 | 1.21 |
1968 | HOU | 32 | 32 | 12 | 15 | 3.31 | 161 | 10 | 1 | 0 | 233.2 | 206 | 86 | 95 | 14 | 89 | 8 | 1.26 |
1969 | HOU | 39 | 37 | 20 | 13 | 2.33 | 232 | 20 | 4 | 0 | 305.1 | 240 | 79 | 97 | 18 | 72 | 1 | 1.02 |
1970 | HOU | 37 | 36 | 16 | 12 | 3.87 | 191 | 17 | 2 | 1 | 269.2 | 263 | 116 | 124 | 31 | 82 | 6 | 1.28 |
1971 | HOU | 24 | 23 | 12 | 6 | 2.72 | 91 | 6 | 2 | 0 | 159.0 | 150 | 48 | 50 | 8 | 33 | 2 | 1.15 |
1972 | HOU | 31 | 31 | 15 | 8 | 3.40 | 115 | 12 | 5 | 0 | 214.2 | 209 | 81 | 87 | 14 | 51 | 5 | 1.21 |
1973 | HOU | 14 | 3 | 1 | 1 | 4.33 | 18 | 0 | 0 | 0 | 27.0 | 27 | 13 | 14 | 3 | 13 | 2 | 1.48 |
1974 | HOU | 33 | 33 | 11 | 10 | 2.90 | 150 | 7 | 3 | 0 | 223.2 | 189 | 72 | 76 | 18 | 82 | 6 | 1.21 |
1975 | HOU | 34 | 34 | 14 | 16 | 4.00 | 127 | 14 | 2 | 0 | 232.0 | 225 | 103 | 109 | 24 | 91 | 7 | 1.36 |
1976 | HOU | 28 | 28 | 13 | 14 | 3.69 | 112 | 7 | 4 | 0 | 187.2 | 171 | 77 | 85 | 9 | 72 | 6 | 1.29 |
1977 | STL | 11 | 9 | 2 | 6 | 4.58 | 6 | 0 | 0 | 0 | 39.1 | 40 | 20 | 21 | 7 | 16 | 2 | 1.42 |
| Career | 356 | 329 | 139 | 123 | 3.31 | 1,493 | 106 | 25 | 1 | 2333.2 | 2,130 | 857 | 948 | 184 | 711 | 50 | 1.22 |
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