Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1971 | HOU | 4 | 4 | 2 | 1 | 3.43 | 29 | 1 | 0 | 0 | 21.0 | 17 | 8 | 9 | 1 | 16 | 0 | 1.57 |
1972 | HOU | 4 | 1 | 1 | 0 | 13.50 | 8 | 0 | 0 | 0 | 6.0 | 10 | 9 | 9 | 0 | 8 | 2 | 3.00 |
1973 | HOU | 16 | 10 | 6 | 2 | 4.00 | 75 | 2 | 1 | 0 | 72.0 | 54 | 32 | 37 | 2 | 38 | 1 | 1.28 |
1974 | HOU | 15 | 9 | 2 | 3 | 4.18 | 42 | 0 | 0 | 0 | 64.2 | 58 | 30 | 31 | 3 | 36 | 1 | 1.45 |
1975 | HOU | 33 | 31 | 12 | 10 | 4.39 | 176 | 7 | 1 | 0 | 203.0 | 178 | 99 | 107 | 8 | 138 | 4 | 1.56 |
1976 | HOU | 39 | 39 | 20 | 15 | 2.75 | 214 | 14 | 3 | 0 | 291.0 | 221 | 89 | 105 | 14 | 151 | 4 | 1.28 |
1977 | HOU | 36 | 36 | 18 | 12 | 2.97 | 214 | 13 | 3 | 0 | 267.0 | 212 | 88 | 94 | 18 | 104 | 0 | 1.18 |
1978 | HOU | 36 | 36 | 18 | 11 | 3.11 | 303 | 16 | 3 | 0 | 275.1 | 192 | 95 | 104 | 12 | 141 | 2 | 1.21 |
1979 | HOU | 38 | 38 | 18 | 13 | 2.71 | 313 | 19 | 4 | 0 | 292.1 | 220 | 88 | 98 | 13 | 98 | 3 | 1.09 |
1980 | HOU | 17 | 17 | 10 | 4 | 1.90 | 119 | 4 | 4 | 0 | 113.2 | 65 | 24 | 31 | 2 | 40 | 0 | 0.92 |
| Career | 238 | 221 | 107 | 71 | 3.15 | 1,493 | 76 | 19 | 0 | 1606.0 | 1,227 | 562 | 625 | 73 | 770 | 17 | 1.24 |
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