P · 8 seasons · 1980 – 1988 · B/T: L/L
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1980 | PIT | 20 | -2.30 | #711 | #87,598 |
| 1981 | PIT | 27 | -2.51 | #822 | #99,848 |
| 1982★ | PIT | 76 | -2.19 | #474 | #76,841 |
| 1983 | PIT | 61 | -2.43 | #825 | #96,396 |
| 1984 | PIT | 43 | -2.34 | #766 | #91,402 |
| 1985 | PIT | 35 | -2.37 | #795 | #93,327 |
| 1986 | NYY | 31 | -2.31 | #503 | #89,035 |
| 1988 | SEA | 39 | -2.22 | #479 | #78,807 |
★ Best season by Z
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1980 | PIT | 20 | -0.86 | #183 | #22,560 |
| 1981 | PIT | 27 | 0.98 | #111 | #14,724 |
| 1982★ | PIT | 76 | 4.52 | #44 | #6,211 |
| 1983 | PIT | 61 | -1.76 | #234 | #28,816 |
| 1984 | PIT | 43 | 1.25 | #118 | #13,818 |
| 1985 | PIT | 35 | -0.33 | #171 | #19,931 |
| 1986 | NYY | 31 | -1.50 | #218 | #26,635 |
| 1988 | SEA | 39 | -1.98 | #252 | #31,331 |
★ Best season by Z