Head to head · 2026 pitching

David Peterson vs Kumar Rocker

In 2026 David Peterson has been worth 0.5 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.

David Peterson NYM

Kumar Rocker TEX

2026 pitching. The stronger figure in each row is highlighted — for ERA, FIP, WHIP and walks that is the lower one.
Statistic	David Peterson	Kumar Rocker
G	32	30
GS	23	27
IP	148.1	148.0
W	9	6
SO	137	138
ERA	4.79	4.38
FIP	3.97	4.31
WHIP	1.50	1.41
K/9	8.3	8.4
BB/9	3.9	3.7
FIP−	95	103
WAR	1.9	1.4

Career

Totalled over the seasons published here, which is not the same as a whole career: a player who debuted before 2015 begins at 2015, not at his real first game.

Career pitching totals. ERA, WHIP and the per-nine rates are recomputed from the components rather than averaged; FIP needs each season’s own constant and is left to the table above.
Statistic	David Peterson	Kumar Rocker
G	163	47
GS	138	44
IP	771.0	224.0
W	46	10
L	38	18
SV	1	0
SO	751	208
BB	327	90
ERA	4.25	4.74
WHIP	1.40	1.43
K/9	8.8	8.4
BB/9	3.8	3.6
HR/9	0.9	1.3
WAR	10.7	1.7

David Peterson’s full profile →Kumar Rocker’s full profile →

More head to heads

The same seasons, measured against somebody else.

David Peterson vs

Kumar Rocker vs

How these are computed

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.