Head to head · 2026 pitching
Aroldis Chapman vs Edwin Díaz
In 2026 Aroldis Chapman has been worth 1.2 more wins. Both lines are computed from play-by-play on the same constants, so they are measured the same way rather than quoted from two sources.
- Two of the 8 most valuable relievers of 2025 by dbWAR.
- Their 2025 seasons were among each other's nearest on rate statistics.
2026 season
| Statistic | Aroldis Chapman | Edwin Díaz |
|---|---|---|
| G | 53 | 21 |
| GS | 0 | 0 |
| IP | 51.2 | 18.2 |
| W | 3 | 2 |
| SO | 71 | 28 |
| ERA | 1.92 | 8.68 |
| FIP | 2.50 | 4.44 |
| WHIP | 1.12 | 1.98 |
| K/9 | 12.4 | 13.5 |
| BB/9 | 4.0 | 5.3 |
| FIP− | 60 | 106 |
| WAR | 1.3 | 0.1 |
Postseason
Box-score figures only: October is kept out of the season constants, so there is no wOBA, FIP or dbWAR for it.
| Statistic | Aroldis Chapman | Edwin Díaz |
|---|---|---|
| G | 47 | 12 |
| GS | 0 | 0 |
| IP | 52.2 | 17.1 |
| W | 3 | 1 |
| SV | 11 | 4 |
| SO | 76 | 20 |
| BB | 21 | 8 |
| ERA | 2.22 | 2.08 |
| WHIP | 1.14 | 0.92 |
| K/9 | 13.0 | 10.4 |
| BB/9 | 3.6 | 4.2 |
Career
Totalled over the seasons published here, which is not the same as a whole career: a player who debuted before 2005 begins at 2005, not at his real first game.
| Statistic | Aroldis Chapman | Edwin Díaz |
|---|---|---|
| G | 916 | 542 |
| GS | 0 | 0 |
| IP | 873.0 | 538.0 |
| W | 63 | 30 |
| L | 52 | 38 |
| SV | 402 | 260 |
| SO | 1,402 | 867 |
| BB | 431 | 193 |
| ERA | 2.48 | 3.03 |
| WHIP | 1.08 | 1.07 |
| K/9 | 14.5 | 14.5 |
| BB/9 | 4.4 | 3.2 |
| HR/9 | 0.6 | 1.0 |
| WAR | 23.3 | 12.9 |
More head to heads
The same seasons, measured against somebody else.
FIP uses the constant solved from this season’s own runs, and FIP− is park-adjusted against the same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page. To put these two beside a third, the comparison page takes up to four.