Regular season · Batting
| 1972 | KC | 51 | 12 | 2 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | .333 | .333 | .333 |
| 1971 | KC | 68 | 20 | 2 | 5 | 2 | 0 | 0 | 0 | 1 | 7 | 0 | .250 | .286 | .350 |
| 1970 | KC | 42 | 14 | 1 | 2 | 0 | 0 | 0 | 0 | 1 | 5 | 0 | .143 | .200 | .143 |
| 1969 | KC | 47 | 18 | 7 | 3 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | .167 | .167 | .167 |
| Career | TOTAL | 208 | 64 | 12 | 14 | 2 | 0 | 0 | 0 | 2 | 20 | 0 | .219 | .242 | .250 |
Regular season · Pitching
| 1984 | OAK | 17 | 3 | 0 | 2 | 23.0 | 15 | 6 | 8 | 8 | 2.35 | 1.00 |
| 1983 | OAK | 49 | 6 | 7 | 4 | 96.0 | 89 | 30 | 32 | 39 | 2.81 | 1.26 |
| 1982 | BOS | 40 | 7 | 0 | 2 | 102.1 | 98 | 26 | 22 | 44 | 2.29 | 1.17 |
| 1981 | BOS | 32 | 4 | 5 | 6 | 59.2 | 61 | 19 | 17 | 35 | 2.87 | 1.31 |
| 1980 | BOS | 62 | 5 | 4 | 24 | 99.0 | 87 | 22 | 20 | 54 | 2.00 | 1.08 |
| 1979 | BOS | 44 | 3 | 2 | 4 | 88.2 | 89 | 27 | 16 | 60 | 2.74 | 1.18 |
| 1978 | BOS | 35 | 2 | 1 | 4 | 61.1 | 74 | 30 | 23 | 24 | 4.40 | 1.58 |
| 1977 | MIN | 61 | 6 | 4 | 7 | 97.1 | 113 | 55 | 33 | 35 | 5.09 | 1.50 |
| 1976 | MIN | 57 | 8 | 1 | 1 | 115.1 | 95 | 32 | 29 | 45 | 2.50 | 1.08 |
| 1975 | MIN | 46 | 5 | 8 | 11 | 75.2 | 76 | 26 | 23 | 41 | 3.09 | 1.31 |
| 1974 | MIN | 50 | 5 | 3 | 4 | 91.2 | 92 | 46 | 26 | 34 | 4.52 | 1.29 |
| 1973 | KC | 6 | 0 | 0 | 1 | 10.0 | 13 | 6 | 4 | 4 | 5.40 | 1.70 |
| 1972 | KC | 51 | 6 | 2 | 9 | 55.1 | 67 | 26 | 33 | 18 | 4.23 | 1.81 |
| 1971 | KC | 67 | 9 | 7 | 17 | 88.1 | 71 | 17 | 30 | 44 | 1.73 | 1.14 |
| 1970 | KC | 41 | 6 | 6 | 1 | 68.1 | 59 | 24 | 23 | 43 | 3.16 | 1.20 |
| 1969 | KC | 31 | 3 | 1 | 0 | 54.0 | 67 | 25 | 21 | 23 | 4.17 | 1.63 |
| Career | TOTAL | 689 | 78 | 51 | 97 | 1186.0 | 1166 | 417 | 360 | 551 | 3.16 | 1.29 |