Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1966 | WSH | 13 | 7 | 2 | 6 | 7.62 | 20 | 0 | 0 | 0 | 39.0 | 60 | 33 | 36 | 4 | 12 | 0 | 1.85 |
1967 | WSH | 7 | 7 | 3 | 1 | 1.75 | 25 | 2 | 1 | 0 | 51.1 | 38 | 10 | 12 | 3 | 10 | 0 | 0.94 |
1968 | WSH | 46 | 10 | 2 | 9 | 3.69 | 63 | 0 | 0 | 1 | 139.0 | 139 | 57 | 63 | 9 | 35 | 4 | 1.25 |
1969 | WSH | 31 | 26 | 14 | 5 | 2.19 | 99 | 5 | 2 | 1 | 193.0 | 156 | 47 | 59 | 11 | 39 | 2 | 1.01 |
1970 | WSH | 36 | 34 | 16 | 12 | 3.00 | 134 | 7 | 3 | 0 | 230.2 | 212 | 77 | 81 | 16 | 71 | 2 | 1.23 |
1971 | WSH | 35 | 35 | 12 | 16 | 3.73 | 113 | 7 | 1 | 0 | 236.2 | 245 | 98 | 110 | 29 | 71 | 5 | 1.34 |
1972 | TEX | 29 | 29 | 8 | 10 | 3.63 | 105 | 1 | 1 | 0 | 173.1 | 183 | 70 | 87 | 11 | 48 | 6 | 1.33 |
1973 | TEX | 7 | 7 | 2 | 5 | 4.24 | 14 | 1 | 1 | 0 | 40.1 | 42 | 19 | 24 | 6 | 17 | 1 | 1.46 |
1973 | CLE | 22 | 17 | 1 | 8 | 6.22 | 41 | 2 | 0 | 0 | 97.0 | 130 | 67 | 74 | 19 | 29 | 6 | 1.64 |
1973 | TOT | 29 | 24 | 3 | 13 | 5.64 | 55 | 3 | 1 | 0 | 137.1 | 172 | 86 | 98 | 25 | 46 | 7 | 1.59 |
1974 | CLE | 25 | 18 | 7 | 5 | 4.10 | 56 | 2 | 1 | 0 | 127.1 | 126 | 58 | 69 | 13 | 29 | 1 | 1.22 |
1975 | CLE | 6 | 3 | 0 | 2 | 4.08 | 11 | 0 | 0 | 0 | 28.2 | 33 | 13 | 17 | 3 | 8 | 3 | 1.43 |
1975 | OAK | 22 | 21 | 11 | 4 | 3.52 | 42 | 2 | 0 | 0 | 122.2 | 112 | 48 | 50 | 12 | 24 | 3 | 1.11 |
1975 | TOT | 28 | 24 | 11 | 6 | 3.63 | 53 | 2 | 0 | 0 | 151.1 | 145 | 61 | 67 | 15 | 32 | 6 | 1.17 |
1976 | OAK | 27 | 15 | 4 | 2 | 4.10 | 34 | 0 | 0 | 0 | 112.0 | 118 | 51 | 54 | 13 | 19 | 1 | 1.22 |
| Career | 306 | 229 | 82 | 85 | 3.67 | 757 | 29 | 10 | 2 | 1591.0 | 1,594 | 648 | 736 | 149 | 412 | 34 | 1.26 |
Astros 
Mariners 
Rangers 
Athletics 
Angels 
BOS 
CIN 
Phillies 
Braves 
Brewers 
Cubs 
Dodgers 
Padres 
Yankees 
Orioles 
Guardians 
Royals 
PIT 
MIA 
WSH 
