| year | team name | league | level | mlb | # | age | w | l | era | g | gs | cg | sho | gr | gf | sv | ip | h | r | er | hr | bb | so | wp | bk | hb | whip | h9 | hr9 | bb9 | so9 | ra9 | so/bb |
| 1973 | Texas Rangers | AL | MLB | TEX | 29 | 23 | 2 | 4 | 3.88 | 32 | 0 | 0 | 0 | 32 | 23 | 8 | 55.2 | 54 | 26 | 24 | 6 | 31 | 28 | 1 | 0 | 3 | 1.53 | 8.73 | 0.97 | 5.01 | 4.53 | 4.20 | 0.90 |
| 1974 | Texas Rangers | AL | MLB | TEX | 29 | 24 | 8 | 9 | 2.24 | 69 | 0 | 0 | 0 | 69 | 53 | 12 | 144.1 | 123 | 51 | 36 | 8 | 40 | 106 | 3 | 0 | 5 | 1.13 | 7.67 | 0.50 | 2.49 | 6.61 | 3.18 | 2.65 |
| 1975 | Texas Rangers | AL | MLB | TEX | 29 | 25 | 8 | 4 | 4.12 | 59 | 0 | 0 | 0 | 59 | 40 | 10 | 107.0 | 96 | 57 | 49 | 10 | 55 | 56 | 2 | 0 | 4 | 1.41 | 8.07 | 0.84 | 4.63 | 4.71 | 4.79 | 1.02 |
| 1976 | Texas Rangers | AL | MLB | TEX | 29 | 26 | 8 | 8 | 3.33 | 46 | 0 | 0 | 0 | 46 | 31 | 5 | 75.2 | 68 | 31 | 28 | 9 | 25 | 41 | 1 | 0 | 4 | 1.23 | 8.09 | 1.07 | 2.97 | 4.88 | 3.69 | 1.64 |
| 1977 | Detroit Tigers | AL | MLB | DET | 29 | 27 | 7 | 7 | 3.15 | 44 | 0 | 0 | 0 | 44 | 34 | 13 | 74.1 | 64 | 29 | 26 | 7 | 17 | 58 | 2 | 0 | 0 | 1.09 | 7.75 | 0.85 | 2.06 | 7.02 | 3.51 | 3.41 |
| 1978 | Detroit Tigers | AL | MLB | DET | 29 | 28 | 2 | 4 | 3.13 | 24 | 0 | 0 | 0 | 24 | 15 | 4 | 37.1 | 48 | 18 | 13 | 1 | 21 | 18 | 1 | 1 | 1 | 1.85 | 11.57 | 0.24 | 5.06 | 4.34 | 4.34 | 0.86 |
| 1978 | Kansas City Royals | AL | MLB | KCA | 16 | 28 | 0 | 0 | 3.86 | 3 | 0 | 0 | 0 | 3 | 2 | 0 | 2.1 | 5 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 2.57 | 19.29 | 0.00 | 3.86 | 0.00 | 3.86 | 0.00 |
| 1979 | Charleston Charlies | IL | AAA | HOU | - | 29 | 0 | 2 | 7.71 | 5 | 0 | 0 | 0 | 5 | 0 | 0 | 7.0 | 7 | 6 | 6 | 1 | 2 | 5 | 2 | 0 | 1 | 1.29 | 9.00 | 1.29 | 2.57 | 6.43 | 7.71 | 2.50 |
| Tot: | MLB (6 yrs) | MLB | 35 | 36 | 3.21 | 277 | 0 | 0 | 0 | 198 | 277 | 52 | 496.2 | 458 | 213 | 177 | 41 | 190 | 307 | 10 | 1 | 17 | 1.30 | 8.30 | 0.74 | 3.44 | 5.56 | 3.86 | 1.62 | ||||
| Tot: | AL (6 yrs) | AL | 35 | 36 | 3.21 | 277 | 0 | 0 | 0 | 198 | 277 | 52 | 496.2 | 458 | 213 | 177 | 41 | 190 | 307 | 10 | 1 | 17 | 1.30 | 8.30 | 0.74 | 3.44 | 5.56 | 3.86 | 1.62 | ||||
| Tot: | Minors (1 yrs) | Minors | 0 | 2 | 7.71 | 5 | 0 | 0 | 0 | 0 | 5 | 0 | 7.0 | 7 | 6 | 6 | 1 | 2 | 5 | 2 | 0 | 1 | 1.29 | 9.00 | 1.29 | 2.57 | 6.43 | 7.71 | 2.50 | ||||
| Tot: | AAA (1 yrs) | AAA | 0 | 2 | 7.71 | 5 | 0 | 0 | 0 | 0 | 5 | 0 | 7.0 | 7 | 6 | 6 | 1 | 2 | 5 | 2 | 0 | 1 | 1.29 | 9.00 | 1.29 | 2.57 | 6.43 | 7.71 | 2.50 | ||||
| Avg: | MLB - 162 Inning avg | MLB | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 162 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | ||||
| Avg: | Minors - 162 Inning avg | College | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 162 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 | 🔒 |
| Strikeouts | Walks | Hittable | SO/BB | vs Power | Durability | Team Success |
| 59 | 48 | 62 | 51 | 62 | 67 | .482 |