P · 7 seasons · 1964 – 1970 · B/T: R/L
Billy McCool was worth +9.0 in saves alone, more than his entire career total of +4.2 once everything else is counted against him. 1966 was the high-water mark, worth +6.6, 15th that season and 3479th of 51,303 player-seasons on record. On the credit side, saves (+9.0) and strikeouts (+0.6). On the debit side, WHIP (-3.6).
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1964 | CIN | 40 | -2.67 | #640 | #104,126 |
| 1965 | CIN | 62 | -2.82 | #659 | #106,738 |
| 1966 | CIN | 57 | -2.32 | #551 | #89,828 |
| 1967 | CIN | 31 | -2.57 | #656 | #101,891 |
| 1968 | CIN | 30 | -2.36 | #502 | #92,290 |
| 1969★ | SD | 54 | -2.20 | #547 | #77,511 |
| 1970 | STL | 18 | -2.34 | #637 | #91,559 |
★ Best season by Z
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1964 | CIN | 40 | 3.52 | #48 | #8,040 |
| 1965 | CIN | 62 | 4.08 | #44 | #6,985 |
| 1966★ | CIN | 57 | 6.61 | #15 | #3,479 |
| 1967 | CIN | 31 | -1.78 | #174 | #29,084 |
| 1968 | CIN | 30 | -4.05 | #282 | #49,972 |
| 1969 | SD | 54 | -1.25 | #173 | #24,938 |
| 1970 | STL | 18 | -2.95 | #307 | #44,760 |
★ Best season by Z