Aroldis Chapman vs Edwin Diaz: Career Stats Comparison
Aroldis Chapman has the better career line of the two, leading 6 of the 12 scored categories on this page (4 further counting totals are shown but not scored). Aroldis Chapman has played 2010–present as a pitcher; Edwin Diaz has played 2016–present as a pitcher.
- ERA (Earned Run Average):
- Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
- W (Wins):
- Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
- SO (Strikeouts):
- For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
- WHIP (Walks and Hits per Inning Pitched):
- Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.
Data updated
Aroldis Chapman (2010–present) and Edwin Diaz (2016–present) — both came up during the 2010s, so the matchup is a direct one. Aroldis Chapman has 63 wins and 1,402 strikeouts through October 6, 2026; Edwin Diaz has 30 wins and 867 strikeouts through October 6, 2026. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Aroldis Chapman, with 2.48 to Edwin Diaz's 3.03.
- Who won more games? Aroldis Chapman, with 63 to Edwin Diaz's 30.
- Who recorded more strikeouts? Aroldis Chapman, with 1,402 to Edwin Diaz's 867.
- Who had the better WHIP? Edwin Diaz, with 1.07 to Aroldis Chapman's 1.08.
- Who pitched more innings? Aroldis Chapman, with 873.0 to Edwin Diaz's 538.0.
- Who threw more shutouts? Neither — both are at 0.
- Who has the higher career Pitcher PIV? Aroldis Chapman, with 36,308 career Pitcher PIV to Edwin Diaz's 21,805.
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. Lower ERA, WHIP and BB/9 lead; higher K/9 leads. 12 of the 16 lines below are scored; the other 4 are counting totals on which fewer is not an achievement, so no one is awarded them. Totals where fewer is not an achievement -- losses, walks and hits allowed -- are left unmarked, because they track how long someone pitched rather than how well. Rate stats are not era-adjusted, so read them against the run environment each player worked in, or use the PIV card below, which is adjusted.
Aroldis Chapman and Edwin Diaz are still active — their totals below are current through October 6, 2026.
| Statistic | Aroldis Chapman | Edwin Diaz |
|---|---|---|
| Wins | Leads: 63 | 30 |
| Losses not scored | 52 | 38 |
| Games | Leads: 916 | 541 |
| Games Started | 0 | 0 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | Leads: 402 | 260 |
| Strikeouts | Leads: 1,402 | 867 |
| Walks not scored | 431 | 193 |
| Hits Allowed not scored | 510 | 382 |
| Home Runs Allowed not scored | 57 | 57 |
| Innings Pitched | Leads: 873.0 | 538.0 |
| ERA | Leads: 2.48 | 3.03 |
| WHIP | 1.08 | Leads: 1.07 |
| K/9 | 14.45 | Leads: 14.50 |
| BB/9 | 4.44 | Leads: 3.23 |
PIV Comparison through 2025
By PIV (Player Impact Value), Aroldis Chapman outpaces Edwin Diaz 36,308 to 21,805 — a longevity gap rather than a per-season one: Aroldis Chapman played 18 seasons to Edwin Diaz's 9, while Edwin Diaz carries the higher per-season figure (2,423 to 2,017). PIV adjusts each season to league baselines, so it's the cleanest way to compare careers across eras.
PIV is computed through the 2025 season. The career totals on this page include 2026 to date, so PIV does not yet reflect the 2026 season.
Peak Seasons
The best single seasons each player produced, ranked by ERA among qualified workloads (120+ innings).
Aroldis Chapman
No seasons meet the qualifying workload, so there is no peak-season list to show.
Edwin Diaz
No seasons meet the qualifying workload, so there is no peak-season list to show.
Verdict
On the head-to-head card, Aroldis Chapman leads in wins, strikeouts, ERA, and innings pitched, while Edwin Diaz owns WHIP and K/9. 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.
Related Matchups
How the Aroldis Chapman and Edwin Diaz careers compare
Aroldis Chapman and Edwin Diaz are both active, and their careers have run side by side since 2016. The table compares 916 games of Aroldis Chapman with 541 of Edwin Diaz across 18 and 9 PIV seasons; totals favor the longer career by default. Where Edwin Diaz comes out ahead, it is in WHIP (1.07 to 1.08), strikeouts per nine (14.50 to 14.45), and walks per nine (3.23 to 4.44). By rate, Aroldis Chapman struck out 14.45 and walked 4.44 per nine innings; Edwin Diaz struck out 14.50 and walked 3.23. Aroldis Chapman and Edwin Diaz's numbers are live and update with each game, so the comparison is a snapshot.
Aroldis Chapman vs Edwin Diaz: Frequently Asked Questions
- Who was better, Aroldis Chapman or Edwin Diaz?
- By the career statistics compared on this page, Aroldis Chapman leads Edwin Diaz in 6 of the 12 scored categories.
- Who had the better ERA?
- Aroldis Chapman, with 2.48 to Edwin Diaz's 3.03.
- Who won more games?
- Aroldis Chapman, with 63 to Edwin Diaz's 30.
- Who recorded more strikeouts?
- Aroldis Chapman, with 1,402 to Edwin Diaz's 867.
- Who had the better WHIP?
- Edwin Diaz, with 1.07 to Aroldis Chapman's 1.08.