| 1964 | Birmingham | Sou | AA | - | kca | 19 | - | 16 | | 100.0 | 4.14 | 1.54 | 9.18 | -- | 4.68 | 6.21 | 0.75 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0-0 | 0 | -- |
| | KC Athletics | AL | MLB | 13 | kca | 19 | - | 5 | 5 | 17.0 | 10.06 | 2.35 | 15.35 | 2.65 | 5.82 | 5.29 | 1.10 | 2.15 | 1 | 0 | 80 | .362 | 91 | -- | -- | -- | -- | 57-105 | 10 | Mel McGaha, Ed Lopat |
| 1965 | Lewiston | Nwst | A- | - | kca | 20 | - | 29 | | 198.0 | 4.27 | 1.64 | 9.41 | -- | 5.36 | 8.36 | 0.64 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0-0 | 0 | -- |
| | KC Athletics | AL | MLB | 43 | kca | 20 | - | 1 | 0 | 1.0 | 9.00 | 4.00 | 18.00 | -- | 18.00 | 0.00 | -- | 2.00 | 0 | 0 | 5 | .400 | 7 | -- | -- | -- | -- | 59-103 | 10 | Haywood Sullivan, Mel McGaha |
| 1966 | Mobile | Sou | AA | - | kca | 21 | - | 19 | | 140.0 | 3.09 | 1.29 | 7.65 | -- | 3.92 | 6.17 | 0.64 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0-0 | 0 | -- |
| | KC Athletics | AL | MLB | 13 | kca | 21 | - | 14 | 14 | 90.1 | 2.49 | 1.36 | 6.97 | 0.10 | 5.28 | 4.68 | 1.13 | 1.26 | 9 | 2 | 326 | .215 | 387 | -- | -- | -- | -- | 74-86 | 7 | Alvin Dark |
| 1967 | Vancouver | PCL | AAA | - | kca | 22 | - | 6 | | 40.0 | 2.25 | 1.53 | 8.78 | -- | 4.95 | 7.88 | 0.63 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0-0 | 0 | -- |
| | KC Athletics | AL | MLB | 13 | kca | 22 | - | 29 | 17 | 103.2 | 5.04 | 1.56 | 8.16 | 0.78 | 5.90 | 5.82 | 1.01 | 1.91 | 7 | 3 | 388 | .242 | 468 | -- | -- | -- | -- | 62-99 | 10 | Alvin Dark, Luke Appling |
| 1968 | Oakland | AL | MLB | 10,13 | oak | 23 | 17 | 32 | 31 | 231.1 | 2.45 | 1.20 | 6.96 | 0.35 | 3.81 | 5.56 | 0.69 | 2.06 | 22 | 7 | 830 | .216 | 950 | -- | -- | -- | -- | 82-80 | 6 | Bob Kennedy |
| 1969 | Oakland | AL | MLB | 24 | oak | 24 | 16 | 32 | 32 | 231.1 | 2.92 | 1.26 | 6.96 | 0.58 | 4.36 | 5.84 | 0.75 | 1.31 | 22 | 6 | 834 | .215 | 966 | -- | -- | -- | -- | 88-74 | 2 | Hank Bauer, John McNamara |
| 1970 | Oakland | AL | MLB | 13 | oak | 25 | - | 29 | 29 | 156.1 | 3.80 | 1.46 | 7.37 | 0.81 | 5.76 | 5.07 | 1.14 | 1.52 | 12 | 8 | 565 | .227 | 688 | -- | -- | -- | -- | 89-73 | 2 | John McNamara |
| 1971 | Oakland | AL | MLB | 13 | oak | 26 | - | 25 | 25 | 140.2 | 4.29 | 1.55 | 9.41 | 0.83 | 4.54 | 4.41 | 1.03 | 1.04 | 12 | 0 | 543 | .271 | 630 | -- | -- | -- | -- | 101-60 | 1 | Dick Williams |
| 1972 | Oakland | AL | MLB | 13 | oak | 27 | 28 | 31 | 30 | 194.1 | 2.50 | 1.29 | 7.60 | 0.46 | 4.03 | 3.98 | 1.01 | 1.23 | 16 | 3 | 701 | .234 | 804 | -- | -- | -- | -- | 93-62 | 1 | Dick Williams |
| 1973 | Oakland | AL | MLB | 13 | oak | 28 | - | 30 | 24 | 150.1 | 4.49 | 1.46 | 9.16 | 0.84 | 4.01 | 4.97 | 0.81 | 1.27 | 7 | 2 | 583 | .262 | 659 | -- | -- | -- | -- | 94-68 | 1 | Dick Williams |
| 1974 | Oakland | AL | MLB | 13 | oak | 29 | - | 34 | 5 | 87.1 | 3.81 | 1.57 | 8.76 | 0.41 | 5.36 | 5.36 | 1.00 | 1.49 | 1 | 3 | 318 | .267 | 384 | -- | -- | -- | -- | 90-72 | 1 | Alvin Dark |
| 1975 | Cleveland | AL | MLB | 13 | cle | 30 | - | 3 | 1 | 10.1 | 2.61 | 1.16 | 3.48 | 0.87 | 6.97 | 8.71 | 0.80 | 3.00 | 0 | 0 | 0 | -- | 0 | -- | -- | -- | -- | 79-80 | 4 | Frank Robinson |
| | Oakland | AL | MLB | 4 | oak | 30 | - | 7 | 2 | 11.0 | 12.27 | 2.73 | 15.55 | 0.82 | 9.00 | 3.27 | 2.75 | 0.60 | 0 | 0 | 0 | -- | 0 | -- | -- | -- | -- | 98-64 | 1 | Alvin Dark |
| | Atlanta | NL | MLB | 13 | atl | 30 | - | 15 | 10 | 56.0 | 7.07 | 1.89 | 12.54 | 0.80 | 4.50 | 4.82 | 0.93 | 1.18 | 2 | 0 | 228 | .342 | 263 | -- | -- | -- | -- | 67-94 | 5 | Clyde King, Connie Ryan |
| 1976 | Chi White Sox | AL | MLB | 20 | chw | 31 | - | 8 | 4 | 28.0 | 5.79 | 1.82 | 9.96 | 0.64 | 6.43 | 5.79 | 1.11 | 1.13 | 1 | 1 | 110 | .282 | 133 | -- | -- | -- | -- | 64-97 | 6 | Paul Richards |
| 1977 | San Jose | PCL | AAA | - | oak | 32 | - | 6 | 6 | 45.0 | 3.60 | 1.76 | 8.60 | 0.40 | 7.20 | 5.20 | 1.38 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 64-80 | 4 | -- |
| Minor League Totals (5 years) | 76 | 6 | 523 | 0 | 1.53 | 8.78 | 0.03 | 4.97 | 7.06 | 0.70 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | .444 | -- | |
| AAA Totals (2 years) | 12 | 6 | 85 | 0 | 1.65 | 8.68 | 0.21 | 6.14 | 6.46 | 0.95 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | .444 | -- | |
| AA Totals (2 years) | 35 | 0 | 240 | 0 | 1.39 | 8.29 | 0.00 | 4.24 | 6.19 | 0.68 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | |
| A- Totals (1 year) | 29 | 0 | 198 | 0 | 1.64 | 9.41 | 0.00 | 5.36 | 8.36 | 0.64 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | |