Regular Season
| Season | TM | G | GS | W | L | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1965 | WSH | 1 | 0 | 0 | 0 | 0.00 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 1 | 0 | 1 | 0 | 2.00 |
1966 | WSH | 12 | 11 | 3 | 3 | 3.75 | 28 | 1 | 0 | 0 | 62.1 | 55 | 26 | 26 | 3 | 39 | 1 | 1.51 |
1967 | WSH | 27 | 26 | 7 | 11 | 3.76 | 74 | 3 | 1 | 0 | 143.2 | 127 | 60 | 67 | 15 | 71 | 3 | 1.38 |
1968 | WSH | 32 | 18 | 4 | 6 | 3.37 | 56 | 0 | 0 | 3 | 117.2 | 116 | 44 | 55 | 8 | 42 | 2 | 1.34 |
1969 | WSH | 31 | 25 | 9 | 8 | 4.30 | 51 | 4 | 0 | 0 | 134.0 | 123 | 64 | 70 | 12 | 67 | 2 | 1.42 |
1970 | CLE | 13 | 12 | 3 | 5 | 4.22 | 35 | 0 | 0 | 0 | 70.1 | 70 | 33 | 34 | 8 | 46 | 1 | 1.65 |
1970 | CWS | 24 | 7 | 0 | 4 | 6.37 | 34 | 0 | 0 | 0 | 70.2 | 85 | 50 | 56 | 12 | 34 | 8 | 1.68 |
1970 | TOT | 37 | 19 | 3 | 9 | 5.30 | 69 | 0 | 0 | 0 | 141.0 | 155 | 83 | 90 | 20 | 80 | 9 | 1.67 |
| Career | 140 | 99 | 26 | 37 | 4.16 | 278 | 8 | 1 | 3 | 599.2 | 577 | 277 | 309 | 58 | 300 | 17 | 1.46 |
Astros 
Mariners 
Rangers 
Athletics 
Angels 
BOS 
CIN 
Phillies 
Braves 
Brewers 
Cubs 
Dodgers 
Padres 
Yankees 
Orioles 
Guardians 
Royals 
PIT 
MIA 
WSH 
