Head to head · 2026 pitching
Edwin Díaz vs David Peterson
In 2026 David Peterson has been worth 1.8 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.
2026 season
| Statistic | Edwin Díaz | David Peterson |
|---|---|---|
| G | 21 | 32 |
| GS | 0 | 23 |
| IP | 18.2 | 148.1 |
| W | 2 | 9 |
| SO | 28 | 137 |
| ERA | 8.68 | 4.79 |
| FIP | 4.44 | 3.97 |
| WHIP | 1.98 | 1.50 |
| K/9 | 13.5 | 8.3 |
| BB/9 | 5.3 | 3.9 |
| FIP− | 106 | 95 |
| WAR | 0.1 | 1.9 |
Postseason
Box-score figures only: October is kept out of the season constants, so there is no wOBA, FIP or dbWAR for it.
| Statistic | Edwin Díaz | David Peterson |
|---|---|---|
| G | 12 | 8 |
| GS | 0 | 1 |
| IP | 17.1 | 16.0 |
| W | 1 | 1 |
| SV | 4 | 1 |
| SO | 20 | 11 |
| BB | 8 | 8 |
| ERA | 2.08 | 2.81 |
| WHIP | 0.92 | 1.56 |
| K/9 | 10.4 | 6.2 |
| BB/9 | 4.2 | 4.5 |
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 | Edwin Díaz | David Peterson |
|---|---|---|
| G | 542 | 163 |
| GS | 0 | 138 |
| IP | 538.0 | 771.0 |
| W | 30 | 46 |
| L | 38 | 38 |
| SV | 260 | 1 |
| SO | 867 | 751 |
| BB | 193 | 327 |
| ERA | 3.03 | 4.25 |
| WHIP | 1.07 | 1.40 |
| K/9 | 14.5 | 8.8 |
| BB/9 | 3.2 | 3.8 |
| HR/9 | 1.0 | 0.9 |
| WAR | 12.9 | 10.7 |
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.