Aroldis Chapman vs Edwin Diaz: Career Stats Comparison
Aroldis Chapman (2010–present) and Edwin Diaz (2016–present) — both came up during the 2010s, so the matchup is a direct one. Aroldis Chapman compiled 60 wins and 1,331 strikeouts; Edwin Diaz put up 28 wins and 839 strikeouts. The numbers below run them through identical career and rate-stat lenses.
Aroldis Chapman
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 | Aroldis Chapman | Edwin Diaz |
|---|---|---|
| Wins | 60 | 28 |
| Losses | 48 | 36 |
| Games | 863 | 520 |
| Games Started | 0 | 0 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | 367 | 253 |
| Strikeouts | 1,331 | 839 |
| Walks | 408 | 182 |
| Hits Allowed | 475 | 356 |
| Home Runs Allowed | 54 | 54 |
| Innings Pitched | 821 | 519 |
| ERA | 2.52 | 2.82 |
| WHIP | 1.08 | 1.04 |
| K/9 | 14.58 | 14.54 |
| BB/9 | 4.47 | 3.15 |
PIV Comparison
By PIV (Player Impact Value), Aroldis Chapman outpaces Edwin Diaz 36,308 to 21,805 — a gap driven primarily by per-season impact (2,017 vs 2,423 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).
Aroldis Chapman — top 0 seasons by ERA (lower is better)
Edwin Diaz — top 0 seasons by ERA (lower is better)
Verdict
On the head-to-head card, Aroldis Chapman leads in wins, strikeouts, ERA, and K/9, while Edwin Diaz owns WHIP. That doesn't settle the era debate, but on the raw scoreboard the edge goes to Aroldis Chapman. PIV agrees: Aroldis Chapman grades out higher across their careers. Click through to each profile for the full season-by-season breakdown.