Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1964 | CLE | 19 | 16 | 10 | 4 | 2.83 | 105 | 9 | 3 | 1 | 127.0 | 94 | 40 | 41 | 13 | 47 | 2 | 1.11 |
| 1965 | CLE | 41 | 30 | 11 | 11 | 3.53 | 152 | 10 | 2 | 1 | 196.1 | 166 | 77 | 88 | 20 | 66 | 3 | 1.18 |
| 1966 | CLE | 46 | 16 | 12 | 11 | 2.79 | 145 | 7 | 5 | 8 | 155.0 | 121 | 48 | 50 | 16 | 50 | 2 | 1.10 |
| 1967 | CLE | 33 | 29 | 12 | 9 | 2.74 | 219 | 9 | 1 | 2 | 213.2 | 177 | 65 | 76 | 24 | 67 | 1 | 1.14 |
| 1968 | CLE | 34 | 32 | 21 | 9 | 1.60 | 264 | 19 | 9 | 0 | 258.1 | 152 | 46 | 53 | 16 | 73 | 4 | 0.87 |
| 1969 | CLE | 38 | 37 | 9 | 20 | 3.71 | 156 | 9 | 1 | 0 | 249.2 | 229 | 103 | 123 | 37 | 129 | 8 | 1.43 |
| 1970 | MIN | 18 | 17 | 7 | 3 | 3.40 | 50 | 2 | 1 | 0 | 92.2 | 84 | 35 | 36 | 12 | 41 | 2 | 1.35 |
| 1971 | BOS | 21 | 10 | 1 | 7 | 4.85 | 59 | 1 | 0 | 0 | 72.1 | 73 | 39 | 42 | 8 | 32 | 1 | 1.45 |
| 1972 | BOS | 43 | 19 | 15 | 6 | 1.91 | 123 | 12 | 6 | 3 | 179.0 | 128 | 38 | 45 | 7 | 65 | 0 | 1.08 |
| 1973 | BOS | 35 | 35 | 20 | 13 | 3.34 | 206 | 23 | 0 | 0 | 272.0 | 217 | 101 | 105 | 32 | 78 | 7 | 1.08 |
| 1974 | BOS | 38 | 38 | 22 | 13 | 2.92 | 176 | 25 | 7 | 0 | 311.1 | 281 | 101 | 106 | 21 | 82 | 4 | 1.17 |
| 1975 | BOS | 35 | 35 | 18 | 14 | 4.02 | 142 | 18 | 2 | 0 | 260.0 | 262 | 116 | 126 | 25 | 72 | 4 | 1.28 |
| 1976 | BOS | 38 | 38 | 21 | 12 | 3.06 | 131 | 19 | 3 | 0 | 279.0 | 274 | 95 | 107 | 25 | 64 | 3 | 1.21 |
| 1977 | BOS | 32 | 32 | 12 | 8 | 4.53 | 124 | 3 | 3 | 0 | 188.2 | 210 | 95 | 98 | 26 | 51 | 2 | 1.38 |
| 1978 | BOS | 32 | 31 | 13 | 8 | 3.31 | 114 | 12 | 5 | 0 | 212.1 | 185 | 78 | 80 | 26 | 57 | 5 | 1.14 |
| 1979 | NYY | 30 | 30 | 13 | 8 | 3.91 | 104 | 5 | 1 | 0 | 195.2 | 190 | 85 | 94 | 22 | 53 | 0 | 1.24 |
| 1980 | NYY | 25 | 25 | 8 | 9 | 4.89 | 84 | 3 | 0 | 0 | 136.1 | 139 | 74 | 79 | 10 | 50 | 1 | 1.39 |
| 1981 | PIT | 9 | 9 | 2 | 5 | 3.92 | 32 | 1 | 0 | 0 | 57.1 | 54 | 25 | 31 | 3 | 19 | 0 | 1.27 |
| 1982 | CAL | 6 | 5 | 2 | 2 | 5.76 | 30 | 0 | 0 | 0 | 29.2 | 39 | 19 | 20 | 3 | 8 | 0 | 1.58 |
| Career | 573 | 484 | 229 | 172 | 3.30 | 2,416 | 187 | 49 | 15 | 3486.1 | 3,075 | 1,280 | 1,400 | 346 | 1,104 | 49 | 1.20 |
Orioles 
Yankees 
Red Sox 
Rays 
Blue Jays 
SEA 
Phillies 
Braves 
Brewers 
Cardinals 
Dodgers 
Diamondbacks 
Guardians 
Twins 
Astros 
DET 
NYM 
CIN 
SDP 
TEX 
