Head to head · 2025 pitching

Hayden Birdsong vs Seth Halvorsen

In 2025 Hayden Birdsong has been worth 0.1 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.

Hayden Birdsong SF

Seth Halvorsen COL

2025 pitching. The stronger figure in each row is highlighted — for ERA, FIP, WHIP and walks that is the lower one.
Statistic	Hayden Birdsong	Seth Halvorsen
G	21	42
GS	10	0
IP	65.2	39.2
W	4	1
SO	68	36
ERA	4.80	4.99
FIP	4.96	5.20
WHIP	1.49	1.56
K/9	9.3	8.2
BB/9	5.1	4.8
FIP−	119	125
WAR	-0.0	-0.1

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	Hayden Birdsong	Seth Halvorsen
G	37	86
GS	26	0
IP	137.2	81.0
W	9	4
L	10	5
SV	0	13
SO	156	72
BB	80	40
ERA	4.77	4.78
WHIP	1.44	1.51
K/9	10.2	8.0
BB/9	5.2	4.4
HR/9	1.4	1.7
WAR	0.3	-0.5

Hayden Birdsong’s full profile →Seth Halvorsen’s full profile →

More head to heads

The same seasons, measured against somebody else.

Hayden Birdsong vs

Seth Halvorsen 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.