Fergie Jenkins vs Jerry Koosman: Career Stats Comparison
Fergie Jenkins (1965–1983) and Jerry Koosman (1967–1985) — both came up during the 1960s, so the matchup is a direct one. Fergie Jenkins compiled 284 wins and 3,192 strikeouts; Jerry Koosman put up 222 wins and 2,556 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Fergie Jenkins
Jerry Koosman
Career Stats Side-by-Side
Every cell below is a career total or career rate. Cells highlighted in green mark the player who leads that line. For pitchers, lower ERA, WHIP, and BB/9 lead; higher K/9 leads.
| Statistic | Fergie Jenkins | Jerry Koosman |
|---|---|---|
| Wins | 284 | 222 |
| Losses | 226 | 209 |
| Games | 664 | 612 |
| Games Started | 594 | 527 |
| Complete Games | 267 | 140 |
| Shutouts | 49 | 33 |
| Saves | 7 | 17 |
| Strikeouts | 3,192 | 2,556 |
| Walks | 997 | 1,198 |
| Hits Allowed | 4,142 | 3,635 |
| Home Runs Allowed | 484 | 290 |
| Innings Pitched | 4,500 | 3,839 |
| ERA | 3.34 | 3.36 |
| WHIP | 1.14 | 1.26 |
| K/9 | 6.38 | 5.99 |
| BB/9 | 1.99 | 2.81 |
PIV Comparison
By PIV (Player Impact Value), Jerry Koosman edges Fergie Jenkins 42,939 to 40,614 — a gap driven primarily by per-season impact (2,147 vs 2,031 per year). PIV adjusts each season to league baselines, so it's the cleanest way to compare careers across eras.
Peak Seasons
The best single seasons each player produced, ranked by ERA among qualified workloads (120+ innings).
Fergie Jenkins — top 3 seasons by ERA (lower is better)
Jerry Koosman — top 3 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Fergie Jenkins leads in wins, strikeouts, ERA, and WHIP, while Jerry Koosman owns no headline categories. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Fergie Jenkins. Note that PIV actually grades Jerry Koosman ahead, which means Fergie Jenkins's edge is partly volume. Click through to each profile for the full season-by-season breakdown.