Naimer Rosario

P ACL D-backs

Age 21 LHP 6'0" / 160 lbs ROK peak 0.3 · 2031

Overview

ROKPROSPECT

ETA2028MLB%0%

Year	Age	Lvl / Team	G	GS	IP	ERA	FIP	K%	BB%	WAR	MLE rates
2025	19	ROKDSL Arizona R…	12	12	60	2.70	1.98	27.8%	7.0%	—	K 18.9% · BB 8.7% · FIP 2.90
2026	20	ROKARI	17	0	25	5.76	4.06	23.3%	11.2%	—	K 15.8% · BB 14.0% · FIP 5.53
2027PROJ	21	MLBARI	34	0	36	5.03	5.03	18.4%	11.9%	-0.2
2028PROJ49% MLB	22	MLBARI	27	0	28	4.82	4.73	19.9%	10.6%	-0.1
2029PROJ73% MLB	23	MLBARI	41	0	43	4.63	4.52	20.8%	9.9%	0.0

Next 3 projected WAR -0.2Projected rows: MLB playing time only, park and league context applied.

Contract

No contract data on file.

Scouting grades · 20-80

Stuff45Control45Command50

Career WAR0 WAR median (P10 0 / P90 0, comp-based) · star 0% · didn't stick 100%

CompsMatt Osterberg (age 22) · Lucas Knowles (age 23) · Estevan Gonzalez (age 23)

2027 FULL-SEASON PROJECTIONrates below = full-season projection

showingPROJ

wRC+ AGAINSTvL 112121vR 129

ERA5.03

FIP5.03

K%18.4%

BB%11.9%

K-BB%6.6%

Proj IP36

Value2027 · WAR

Runs saved vs league avg · 36 IP

Grades · Contract

Scouting Grades

STUF4545

CTRL4545

CMD5050

K†4555

Contract

No contract data on file. Pre-MLB players and minor-league free agents do not yet have salary projections — entries are added at first 40-man roster placement.

Career Stats + Projections

Real MLB stats plus park-adjusted projections — this season (so far / rest / full), then future seasons and career totals.

show model inputsbasis chips: RAW = as recorded · CTX = with park/league context · A+C = actual + context combined · MLE = level/park-neutral

Methodology▸ how WAR & MLE are computed

Stats are park-neutral MLB equivalents. The "TEAM" column shows current org affiliation only — we do NOT project at that team's park.
Rates (K%, BB%, HR-BF) are park-stripped; MiLB stat lines are translated to their MLB-equivalent via per-level MLE factors.
WAR is computed from projected runs prevented vs a replacement pitcher (the marginal arm a team would call up if this pitcher were unavailable) — calibrated to industry-standard fWAR.

Year	Age	Lvl	Team	G	GS	IP	BF	K	BB	HR	GS%	IP/G	K%	BB%	K-BB%	HR%	ERA	FIP	WAR
▸ Career — actual stats, one row per year (as recorded, no adjustments)
▸ Career — adjusted (each season translated to a park/league-neutral MLB-equivalent line; levels combined per year)
▸ Model inputs — neutral MLE (past 3 seasons + 2027 so far)
2024	18	ROK MLE	DSL Arizona Black	12	5	36	155	39	22	0	42%	3.0	17.1%	17.7%	-0.6%	0.0%	4.04	3.90	—
2024	18	ROK MLE	DSL Arizona Black	12	5	36	155	39	22	0	42%	3.0	17.1%	17.7%	-0.6%	0.0%	4.04	3.90	—
2024	18	ROK RAW	DSL Arizona Black	12	5	36	155	39	22	0	42%	3.0	25.2%	14.2%	11.0%	0.0%	4.04	2.76	—
2025	19	ROK MLE	DSL Arizona Red	12	12	60	230	64	16	1	100%	5.0	18.9%	8.7%	10.2%	0.5%	2.70	2.90	—
2025	19	ROK MLE	DSL Arizona Red	12	12	60	230	64	16	1	100%	5.0	18.9%	8.7%	10.2%	0.5%	2.70	2.90	—
2025	19	ROK RAW	DSL Arizona Red	12	12	60	230	64	16	1	100%	5.0	27.8%	7.0%	20.9%	0.4%	2.70	1.98	—
2026	20	ROK MLE	ACL D-backs	17	0	25	116	27	13	3	0%	1.5	15.8%	14.0%	1.8%	3.6%	5.76	5.53	—
2026	20	ROK MLE	ACL D-backs	17	0	25	116	27	13	3	0%	1.5	15.8%	14.0%	1.8%	3.6%	5.76	5.53	—
2026	20	ROK RAW	ACL D-backs	17	0	25	116	27	13	3	0%	1.5	23.3%	11.2%	12.1%	2.6%	5.76	4.06	—
▸ 2027 season — projected remainder (no 2027 stats recorded)
2027	21	MLB	ARI	34	0	36	152	28	18	4	0%	1.1	18.4%	11.9%	6.6%	2.9%	5.03	5.03	-0.2
▸ Career projection (2028+) — MLB context, MLB playing time (IP × MLB%)
2028	22	MLB MLE	ARI	54	0	57	239	48	25	7	0%	1.1	19.9%	10.6%	9.2%	2.9%	4.82	4.73	-0.1
2029	23	MLB MLE	ARI	56	0	59	248	52	24	7	0%	1.1	20.8%	9.9%	11.0%	2.8%	4.63	4.52	+0.0
2030	24	MLB MLE	ARI	57	0	60	255	55	24	7	0%	1.1	21.5%	9.4%	12.2%	2.8%	4.49	4.39	+0.1
2031	25	MLB MLE	ARI	58	0	61	258	57	23	7	0%	1.1	21.9%	9.1%	12.9%	2.8%	4.39	4.32	+0.2
2032	26	MLB MLE	ARI	58	0	61	258	57	23	7	0%	1.1	22.1%	9.0%	13.1%	2.8%	4.33	4.29	+0.2
2033	27	MLB MLE	ARI	57	0	60	254	56	23	7	0%	1.1	22.1%	9.1%	13.0%	2.9%	4.33	4.33	+0.2
2028	22	MLB CTX	ARI	27	0	28	118	23	13	3	0%	1.0	19.9%	10.6%	9.2%	2.9%	4.82	4.73	-0.1
2029	23	MLB CTX	ARI	41	0	43	182	38	18	5	0%	1.0	20.8%	9.9%	11.0%	2.8%	4.63	4.52	+0.0
2030	24	MLB CTX	ARI	48	0	50	211	45	20	6	0%	1.0	21.5%	9.4%	12.2%	2.8%	4.49	4.39	+0.1
2031	25	MLB CTX	ARI	51	0	54	228	50	21	6	0%	1.1	21.9%	9.1%	12.9%	2.8%	4.39	4.32	+0.1
2032	26	MLB CTX	ARI	53	0	56	236	52	21	7	0%	1.1	22.1%	9.0%	13.1%	2.8%	4.33	4.29	+0.2
2033	27	MLB CTX	ARI	53	0	56	236	52	22	7	0%	1.1	22.1%	9.1%	13.0%	2.9%	4.33	4.33	+0.1
▸ Career totals — MLB only (actual + projected)
Career	—	RAW		273	0	286	1209	261	114	34	0%	1.0	21.6%	9.4%	12.2%	2.8%	4.46	4.02	+1.8
/ 200 IP	—	RAW		190	0	200	844	182	80	24	0%	1.1	21.6%	9.4%	12.2%	2.8%	4.46	4.02	+1.3
Career	—	MLE		41	17	121	501	88	64	5	41%	2.9	17.6%	12.7%	4.9%	1.1%	3.73	3.82	+0.5
/ 200 IP	—	MLE		68	28	200	830	147	106	9	41%	2.9	17.6%	12.7%	4.9%	1.1%	3.73	3.82	+0.3

Career Path Comps

What happened to similar pitchers from this age · Y-axis: ERA+ (100 = league avg, 150 = elite, 80 = below) · Bands: P10–P90 outer, P25–P75 inner · Gold: OGILVIE projection

			Profile at Match Age					Next 3 Yrs				Career
Comp	Age	Role	FIP	K%	BB%	HR/BF	BABIP	FIP	K%	K-BB%	IP	ΔFIP	Low FIP	IP	Match
Naimer Rosario (OGILVIE)	—	—	5.03	18.4%	11.9%	2.9%	—	4.54	20.8%	10.8%	176	-0.49	—	—	—
Matt Osterberg L 2021 · 3.88 FIP	22	SW	3.88	20.2%	12.3%	1.7%	.255	4.04	15.6%	9.3%	274	+0.16	3.70	294	85
Lucas Knowles L 2021 · 3.90 FIP	23	SW	3.90	20.5%	12.9%	1.6%	.366	4.22	18.5%	9.4%	177	+0.32	3.37	308	81
Estevan Gonzalez L 2015 · 4.77 FIP	23	SW	4.77	14.1%	10.7%	2.8%	.322	4.86	14.7%	0.1%	130	+0.09	4.58	195	80
Dante Biasi L 2021 · 4.91 FIP	23	SW	4.91	21.5%	12.6%	3.7%	.251	5.70	19.3%	2.3%	153	+0.79	4.91	224	80
Harry Gustin L 2024 · 3.91 FIP	22	SU	3.91	20.7%	11.0%	2.1%	.331	4.33	22.9%	12.7%	109	+0.42	3.70	152	80
Felix Doubront L 2010 · 4.00 FIP	22	SW	4.00	20.4%	8.8%	2.7%	.312	4.02	21.6%	11.6%	323	+0.02	3.44	719	79
Matt Walker L 2021 · 4.21 FIP	23	SU	4.21	16.7%	13.3%	1.5%	.324	4.62	15.5%	4.0%	94	+0.41	4.21	156	79
Sean Mellen L 2021 · 4.59 FIP	23	SU	4.59	21.5%	12.1%	3.2%	.364	4.01	21.3%	10.9%	55	-0.58	4.01	101	79
Connor Oliver L 2024 · 4.34 FIP	23	SW	4.34	17.3%	12.1%	2.1%	.314	6.07	19.2%	3.4%	165	+1.73	4.34	244	79
Jack Patterson L 2018 · 4.72 FIP	22	SP-	4.72	14.7%	8.0%	3.4%	.299	3.10	19.4%	7.9%	80	-1.62	3.10	127	79
Joey Marciano L 2017 · 3.97 FIP	22	SW	3.97	15.1%	11.8%	1.2%	.266	4.99	16.3%	6.1%	153	+1.02	3.65	330	78
Frankeli Arias L 2024 · 5.57 FIP	21	SW	5.57	18.0%	12.2%	4.5%	.305	5.51	14.9%	1.5%	124	-0.06	3.87	298	78
Scott Squier L 2015 · 5.28 FIP	22	SW	5.28	12.2%	11.2%	3.3%	.362	4.06	13.9%	7.9%	234	-1.22	3.29	276	78
Thomas Ireland L 2023 · 4.64 FIP	21	SP-	4.64	16.7%	8.7%	3.4%	.286	3.79	17.1%	7.8%	206	-0.85	2.95	250	78
Alex Winkelman L 2016 · 4.44 FIP	22	SW	4.44	15.8%	14.7%	1.5%	.344	3.77	18.8%	6.5%	181	-0.67	3.40	246	78
Oscar Armenta L 2015 · 5.35 FIP	21	SW	5.35	11.8%	10.8%	3.4%	.318	4.84	9.8%	-5.0%	59	-0.51	3.84	118	78
Johan Santana L 2000 · 4.98 FIP	21	SW	4.98	16.1%	13.6%	2.8%	.338	3.27	26.0%	17.4%	310	-1.71	2.76	2,026	77
Brayan Perez L 2022 · 4.93 FIP	21	SW	4.93	13.2%	9.3%	3.2%	.316	3.28	16.3%	6.9%	96	-1.65	2.60	318	77
Victor Cabreja L 2023 · 4.18 FIP	21	SW	4.18	15.8%	14.5%	1.1%	.213	5.20	11.8%	2.2%	185	+1.02	3.79	254	77
Drew Harrington L 2016 · 4.18 FIP	21	SU	4.18	15.7%	9.6%	2.1%	.295	4.14	12.5%	5.4%	175	-0.04	3.17	190	77

Career Comps

Completed MLB careers (no pro action in 2+ yrs) whose totals — actual + projected — most resemble this player's. Pool: 1,474 reliever careers (754 from 1990-2025 + 720 historical, 1901-2023), also matched on career-to-date at the same age. * Historical (Lahman) careers: rates era-adjusted to 2001-24 league levels; WAR is an OGILVIE proxy.

Player	162s	IP/yr	K%	BB%	HR/9	ERA
OGILVIE CAREER PROJECTION	2.0	56	21.2%	9.7%	1.10	4.54
Mark Lowe ('16)	1.9	64	20.9%	9.7%	1.10	4.22
Jacob Barnes ('25)	1.7	48	22.0%	9.2%	1.15	4.79
Josias Manzanillo ('04)	1.7	57	20.0%	10.2%	1.21	4.71
Bill Scherrer ('82-'88, 1 WAR*)	1.6	62	20.7%*	10.2%*	1.19*	4.44*
Bill Pleis ('61-'66, -0 WAR*)	1.4	56	19.7%*	9.8%*	1.15*	4.53*
Jerry Don Gleaton ('79-'92, 2 WAR*)	2.2	64	19.4%*	10.2%*	1.05*	4.44*