Head to head · 2026 pitching

Merrill Kelly vs Ryne Nelson

In 2026 the two have been worth the same -0.2 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.

Teammates: two of the 3 most valuable pitchers on the 2025 Arizona Diamondbacks.
Their 2025 seasons were among each other's nearest on rate statistics.

Merrill Kelly AZ

Ryne Nelson AZ

2026 season

2026 pitching. The stronger figure in each row is highlighted — for ERA, FIP, WHIP and walks that is the lower one.
Statistic	Merrill Kelly	Ryne Nelson
G	29	19
GS	29	15
IP	162.0	87.1
W	10	3
SO	113	66
ERA	4.94	4.95
FIP	5.33	5.27
WHIP	1.46	1.26
K/9	6.3	6.8
BB/9	3.9	2.5
FIP−	127	126
WAR	-0.2	-0.2

Postseason

Box-score figures only: October is kept out of the season constants, so there is no wOBA, FIP or dbWAR for it.

Every published postseason, pitching, summed with the rates recomputed from the counts.
Statistic	Merrill Kelly	Ryne Nelson
G	4	3
GS	4	0
IP	24.0	6.1
W	3	0
SV	0	0
SO	28	7
BB	8	1
ERA	2.25	5.68
WHIP	0.83	1.74
K/9	10.5	9.9
BB/9	3.0	1.4

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.

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 season table.
Statistic	Merrill Kelly	Ryne Nelson
G	201	112
GS	201	93
IP	1,170.1	554.1
W	75	29
L	67	23
SV	0	2
SO	1,024	436
BB	370	151
ERA	3.93	4.30
WHIP	1.23	1.23
K/9	7.9	7.1
BB/9	2.8	2.5
HR/9	1.2	1.3
WAR	15.1	5.3

Merrill Kelly’s full profile →Ryne Nelson’s full profile →

More head to heads

The same seasons, measured against somebody else.

Merrill Kelly vs

Ryne Nelson 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.