P · 16 seasons · 1965 – 1980 · B/T: L/L
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1965 | BAL | 5 | -2.31 | #523 | #88,473 |
| 1966★ | PHI | 69 | -2.10 | #357 | #65,333 |
| 1967 | WS2 | 61 | -2.46 | #628 | #98,115 |
| 1968 | WS2 | 32 | -2.16 | #344 | #73,415 |
| 1969 | WS2 | 53 | -2.30 | #663 | #87,906 |
| 1970 | WS2 | 71 | -2.63 | #768 | #103,275 |
| 1971 | OAK | 55 | -2.46 | #677 | #97,854 |
| 1972 | OAK | 54 | -2.17 | #457 | #74,666 |
| 1973 | OAK | 53 | -2.28 | #435 | #85,513 |
| 1974 | OAK | 45 | -2.25 | #476 | #81,775 |
| 1975 | CHC | 58 | -2.61 | #777 | #102,683 |
| 1976 | CHC | 58 | -2.42 | #696 | #95,861 |
| 1977 | TEX | 42 | -2.33 | #487 | #90,439 |
| 1978 | MON | 60 | -2.31 | #726 | #88,706 |
| 1979 | STL | 48 | -2.36 | #716 | #92,545 |
| 1980 | STL | 2 | -2.29 | #501 | #86,677 |
★ Best season by Z
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1965 | BAL | 5 | -3.31 | #275 | #47,263 |
| 1966 | PHI | 69 | 2.60 | #69 | #9,986 |
| 1967 | WS2 | 61 | 3.98 | #54 | #7,135 |
| 1968 | WS2 | 32 | -0.46 | #127 | #20,506 |
| 1969 | WS2 | 53 | 4.33 | #44 | #6,520 |
| 1970★ | WS2 | 71 | 6.51 | #24 | #3,586 |
| 1971 | OAK | 55 | 2.02 | #80 | #11,504 |
| 1972 | OAK | 54 | 2.33 | #74 | #10,667 |
| 1973 | OAK | 52 | 1.46 | #92 | #13,133 |
| 1974 | OAK | 45 | -2.19 | #228 | #34,385 |
| 1975 | CHC | 58 | 0.49 | #116 | #16,428 |
| 1976 | CHC | 58 | 2.02 | #87 | #11,488 |
| 1977 | TEX | 42 | -0.49 | #166 | #20,655 |
| 1978 | MON | 60 | 0.86 | #117 | #15,102 |
| 1979 | STL | 48 | -0.78 | #180 | #22,099 |
| 1980 | STL | 2 | -2.79 | #292 | #42,955 |
★ Best season by Z