Head to head · 2026 pitching

Aroldis Chapman vs Erik Miller

So far in 2026 Aroldis Chapman has been worth 0.4 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.

Aroldis Chapman BOS

Erik Miller SF

2026 pitching, season in progress. The stronger figure in each row is highlighted — for ERA, FIP, WHIP and walks that is the lower one.
Statistic	Aroldis Chapman	Erik Miller
G	52	55
GS	0	1
IP	50.2	49.1
W	3	4
SO	68	73
ERA	1.95	2.92
FIP	2.61	3.18
WHIP	1.14	1.38
K/9	12.1	13.3
BB/9	4.1	6.0
FIP−	62	76
WAR	1.3	0.9

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	Aroldis Chapman	Erik Miller
G	656	164
GS	0	11
IP	619.1	146.2
W	48	12
L	36	7
SV	288	5
SO	969	182
BB	309	91
ERA	2.56	3.07
WHIP	1.12	1.36
K/9	14.1	11.2
BB/9	4.5	5.6
HR/9	0.6	0.6
WAR	15.8	1.9

Aroldis Chapman’s full profile →Erik Miller’s full profile →

More head to heads

The same seasons, measured against somebody else.

Aroldis Chapman vs

Erik Miller 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.