Zack Greinke vs Roy Halladay: Career Stats Comparison
Zack Greinke (2004–present) and Roy Halladay (1998–2013) — breaking in during the 2000s and the 1990s respectively, so they pitched against very different hitting environments. Zack Greinke compiled 225 wins and 2,979 strikeouts; Roy Halladay put up 203 wins and 2,117 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Zack Greinke
Roy Halladay
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 | Zack Greinke | Roy Halladay |
|---|---|---|
| Wins | 225 | 203 |
| Losses | 156 | 105 |
| Games | 586 | 416 |
| Games Started | 541 | 390 |
| Complete Games | 17 | 67 |
| Shutouts | 5 | 20 |
| Saves | 1 | 1 |
| Strikeouts | 2,979 | 2,117 |
| Walks | 762 | 592 |
| Hits Allowed | 3,207 | 2,646 |
| Home Runs Allowed | 367 | 236 |
| Innings Pitched | 3,389 | 2,749 |
| ERA | 3.49 | 3.38 |
| WHIP | 1.17 | 1.18 |
| K/9 | 7.91 | 6.93 |
| BB/9 | 2.02 | 1.94 |
PIV Comparison
By PIV (Player Impact Value), Roy Halladay leads Zack Greinke 66,478 to 58,246 — a gap driven primarily by per-season impact (4,155 vs 2,648 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).
Zack Greinke — top 3 seasons by ERA (lower is better)
Roy Halladay — top 3 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Zack Greinke leads in wins, strikeouts, WHIP, and K/9, while Roy Halladay owns ERA. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Zack Greinke. Note that PIV actually grades Roy Halladay ahead, which means Zack Greinke's edge is partly volume. Click through to each profile for the full season-by-season breakdown.