P · 12 seasons · 1948 – 1961 · B/T: R/R
Warren Hacker is the extreme version of a specialist. +8.5 of roto value came from WHIP, yet his career total is only +4.7. No season of his scores higher than 1952, at +8.2, 13th that season and 2133rd of 51,303 player-seasons on record. On the credit side, WHIP (+8.5) and strikeouts (+0.3). On the debit side, ERA (-3.2).
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1948 | CHC | 3 | -2.04 | #506 | #55,756 |
| 1949 | CHC | 32 | -2.63 | #459 | #103,211 |
| 1950 | CHC | 5 | -2.49 | #419 | #99,305 |
| 1951 | CHC | 2 | -2.33 | #341 | #91,049 |
| 1952 | CHC | 34 | -2.73 | #506 | #105,327 |
| 1953 | CHC | 42 | -2.29 | #345 | #86,567 |
| 1954 | CHC | 43 | -2.05 | #259 | #57,914 |
| 1955★ | CHC | 35 | -1.91 | #269 | #48,848 |
| 1956 | CHC | 34 | -2.75 | #519 | #105,594 |
| 1957 | PHI | 35 | -2.34 | #394 | #91,118 |
| 1958 | PHI | 9 | -2.29 | #377 | #86,470 |
| 1961 | CWS | 42 | -2.39 | #465 | #94,417 |
★ Best season by Z
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1948 | CHC | 3 | -3.00 | #313 | #45,254 |
| 1949 | CHC | 30 | -1.22 | #104 | #24,745 |
| 1950 | CHC | 5 | -2.19 | #146 | #34,462 |
| 1951 | CHC | 2 | -2.70 | #150 | #41,979 |
| 1952★ | CHC | 33 | 8.16 | #13 | #2,133 |
| 1953 | CHC | 39 | 3.83 | #29 | #7,449 |
| 1954 | CHC | 39 | 1.83 | #57 | #12,075 |
| 1955 | CHC | 35 | 4.93 | #28 | #5,572 |
| 1956 | CHC | 34 | -1.67 | #131 | #28,024 |
| 1957 | PHI | 35 | -0.95 | #118 | #23,088 |
| 1958 | PHI | 9 | -3.64 | #236 | #48,984 |
| 1961 | CWS | 42 | 1.29 | #79 | #13,693 |
★ Best season by Z