Head to head · 2025 pitching

Kenley Jansen vs David Robertson

In 2025 Kenley Jansen 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.

Kenley Jansen LAA

David Robertson PHI

2025 pitching. The stronger figure in each row is highlighted — for ERA, FIP, WHIP and walks that is the lower one.
Statistic	Kenley Jansen	David Robertson
G	62	20
GS	0	0
IP	59.0	17.2
W	5	2
SO	57	22
ERA	2.59	4.08
FIP	3.98	4.95
WHIP	0.95	1.47
K/9	8.7	11.2
BB/9	2.9	4.1
FIP−	96	119
WAR	0.5	-0.0

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	Kenley Jansen	David Robertson
G	698	479
GS	0	1
IP	682.2	501.0
W	44	43
L	36	27
SV	391	132
SO	879	652
BB	205	199
ERA	2.76	3.02
WHIP	0.97	1.12
K/9	11.6	11.7
BB/9	2.7	3.6
HR/9	1.0	0.9
WAR	13.2	8.6

Kenley Jansen’s full profile →David Robertson’s full profile →

More head to heads

The same seasons, measured against somebody else.

Kenley Jansen vs

David Robertson 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.