Aroldis Chapman vs Mason Miller: Career Stats Comparison
Aroldis Chapman and Mason Miller are close to even, splitting the 12 scored categories on this page 5–5 (4 further counting totals are shown but not scored). Aroldis Chapman has played 2010–present as a pitcher; Mason Miller has played 2023–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 Mason Miller (2023–present) — breaking in during the 2010s and the 2020s respectively, so they pitched against very different hitting environments. Aroldis Chapman has 63 wins and 1,402 strikeouts through October 12, 2026; Mason Miller has 8 wins and 375 strikeouts through October 12, 2026. The numbers below run them through identical career and rate-stat lenses.
Quick answer
- Who had the better ERA? Mason Miller, with 2.47 to Aroldis Chapman's 2.48.
- Who won more games? Aroldis Chapman, with 63 to Mason Miller's 8.
- Who recorded more strikeouts? Aroldis Chapman, with 1,402 to Mason Miller's 375.
- Who had the better WHIP? Mason Miller, with 0.94 to Aroldis Chapman's 1.08.
- Who pitched more innings? Aroldis Chapman, with 873.0 to Mason Miller's 230.0.
- 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 Mason Miller's 6,845.
Aroldis Chapman
Mason Miller
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, and the 2010s and the 2020s were different run environments, so read them against their eras, or use the PIV card below, which is adjusted.
Aroldis Chapman and Mason Miller are still active — their totals below are current through October 12, 2026.
| Statistic | Aroldis Chapman | Mason Miller |
|---|---|---|
| Wins | Leads: 63 | 8 |
| Losses not scored | 52 | 9 |
| Games | Leads: 916 | 191 |
| Games Started | 0 | Leads: 6 |
| Complete Games | 0 | 0 |
| Shutouts | 0 | 0 |
| Saves | Leads: 402 | 88 |
| Strikeouts | Leads: 1,402 | 375 |
| Walks not scored | 431 | 91 |
| Hits Allowed not scored | 510 | 125 |
| Home Runs Allowed not scored | 57 | 16 |
| Innings Pitched | Leads: 873.0 | 230.0 |
| ERA | 2.48 | Leads: 2.47 |
| WHIP | 1.08 | Leads: 0.94 |
| K/9 | 14.45 | Leads: 14.67 |
| BB/9 | 4.44 | Leads: 3.56 |
PIV Comparison through 2025
By PIV (Player Impact Value), Aroldis Chapman outpaces Mason Miller 36,308 to 6,845 — driven by both sides of the ledger: 2,017 PIV per season to 1,711, across 18 seasons to 4. 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.
Mason Miller
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, and innings pitched, while Mason Miller owns ERA, 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 Mason Miller careers compare
The two careers overlap from 2023 on, with both players still active. Playing time explains much of the gap in the counting rows: Aroldis Chapman has appeared in 916 games to Mason Miller's 191. The per-nine rows read 14.45 strikeouts and 4.44 walks for Aroldis Chapman, 14.67 and 3.56 for Mason Miller. Aroldis Chapman worked mostly in relief (0 starts in 916 games, 402 saves), and Mason Miller worked mostly in relief (6 starts in 191 games, 88 saves). Mason Miller allowed fewer baserunners, a 0.94 WHIP to Aroldis Chapman's 1.08. Because Aroldis Chapman and Mason Miller are still playing, the totals above will keep moving through the season.
Aroldis Chapman vs Mason Miller: Frequently Asked Questions
- Who had the better ERA?
- Mason Miller, with 2.47 to Aroldis Chapman's 2.48.
- Who won more games?
- Aroldis Chapman, with 63 to Mason Miller's 8.
- Who recorded more strikeouts?
- Aroldis Chapman, with 1,402 to Mason Miller's 375.
- Who had the better WHIP?
- Mason Miller, with 0.94 to Aroldis Chapman's 1.08.