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