Tommy John vs Jerry Koosman: Career Stats Comparison
Tommy John (1963–1989) and Jerry Koosman (1967–1985) — both came up during the 1960s, so the matchup is a direct one. Tommy John compiled 288 wins and 2,245 strikeouts; Jerry Koosman put up 222 wins and 2,556 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Tommy John
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 | Tommy John | Jerry Koosman |
|---|---|---|
| Wins | 288 | 222 |
| Losses | 231 | 209 |
| Games | 760 | 612 |
| Games Started | 700 | 527 |
| Complete Games | 162 | 140 |
| Shutouts | 46 | 33 |
| Saves | 4 | 17 |
| Strikeouts | 2,245 | 2,556 |
| Walks | 1,259 | 1,198 |
| Hits Allowed | 4,783 | 3,635 |
| Home Runs Allowed | 302 | 290 |
| Innings Pitched | 4,710 | 3,839 |
| ERA | 3.34 | 3.36 |
| WHIP | 1.28 | 1.26 |
| K/9 | 4.29 | 5.99 |
| BB/9 | 2.41 | 2.81 |
PIV Comparison
By PIV (Player Impact Value), Jerry Koosman edges Tommy John 42,939 to 39,802 — a gap driven primarily by per-season impact (2,147 vs 1,422 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).
Tommy John — 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, Jerry Koosman leads in strikeouts, WHIP, and K/9, while Tommy John owns wins, ERA, and innings pitched. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Jerry Koosman. PIV agrees: Jerry Koosman grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.