Career Stats
| Season | TM | LG | W | L | ERA | G | GS | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | SO |
|---|
| 1970 | HOU | NL | 1 | 2 | 5.63 | 4 | 4 | 1 | 0 | 0 | 24.0 | 28 | 15 | 15 | 1 | 5 | 0 | 13 |
| 1971 | HOU | NL | 8 | 8 | 2.53 | 33 | 23 | 7 | 2 | 0 | 188.1 | 162 | 53 | 60 | 8 | 53 | 4 | 131 |
| 1972 | HOU | NL | 6 | 8 | 3.91 | 30 | 24 | 1 | 0 | 0 | 156.1 | 163 | 68 | 75 | 19 | 62 | 0 | 113 |
| 1973 | HOU | NL | 9 | 12 | 4.20 | 46 | 26 | 5 | 0 | 4 | 201.1 | 197 | 94 | 101 | 18 | 74 | 4 | 149 |
| 1974 | HOU | NL | 8 | 7 | 2.79 | 70 | 0 | 0 | 0 | 10 | 103.1 | 98 | 32 | 38 | 3 | 37 | 4 | 48 |
| 1975 | HOU | NL | 4 | 8 | 3.22 | 34 | 9 | 2 | 0 | 2 | 109.0 | 114 | 39 | 42 | 9 | 30 | 2 | 54 |
| 1976 | HOU | NL | 4 | 3 | 2.15 | 52 | 0 | 0 | 0 | 19 | 92.0 | 76 | 22 | 23 | 5 | 26 | 2 | 49 |
| 1977 | HOU | NL | 5 | 8 | 2.72 | 42 | 5 | 0 | 0 | 8 | 86.0 | 80 | 26 | 32 | 2 | 28 | 2 | 45 |
| 1978 | HOU | NL | 10 | 6 | 2.70 | 52 | 6 | 4 | 2 | 7 | 133.1 | 136 | 40 | 44 | 2 | 37 | 1 | 71 |
| 1979 | HOU | NL | 11 | 6 | 3.04 | 26 | 24 | 10 | 2 | 0 | 177.2 | 155 | 60 | 67 | 14 | 35 | 0 | 58 |
| 1980 | HOU | NL | 12 | 13 | 3.20 | 32 | 32 | 6 | 3 | 0 | 222.1 | 230 | 79 | 90 | 15 | 41 | 7 | 84 |
| 1981 | CAL | AL | 11 | 7 | 2.88 | 20 | 20 | 10 | 4 | 0 | 153.0 | 143 | 49 | 54 | 7 | 27 | 4 | 55 |
| 1982 | CAL | AL | 13 | 11 | 3.87 | 37 | 35 | 12 | 4 | 0 | 228.0 | 225 | 98 | 108 | 25 | 57 | 11 | 73 |
| 1983 | CAL | AL | 11 | 12 | 4.06 | 31 | 31 | 11 | 1 | 0 | 219.1 | 226 | 99 | 107 | 21 | 61 | 4 | 81 |
| 1984 | CAL | AL | 1 | 1 | 2.20 | 2 | 2 | 1 | 0 | 0 | 16.1 | 14 | 4 | 4 | 2 | 3 | 0 | 10 |
| 1986 | CAL | AL | 0 | 1 | 9.53 | 10 | 0 | 0 | 0 | 1 | 17.0 | 24 | 18 | 21 | 4 | 10 | 2 | 13 |
| Career | | | 114 | 113 | 3.37 | 521 | 241 | 70 | 18 | 51 | 2127.1 | 2,071 | 796 | 881 | 155 | 586 | 47 | 1,047 |
