How to read this player page

The big number is his career NUT, his total production against league average, with its letter grade. This season's NUT sits just below it, followed by his season and career lines, recent form over 7, 14 and 30 days, game logs, and percentile ranks against every qualified player. NUT is built on the advanced hitting and pitching stats analysts trust, with defense left out, so the number reflects what the player controls.

Frank Castillo 2026 Season · Albuquerque Isotopes

Frank Castillo played in the majors from 1991 to 2005. His career NUT is +0.9, #1,462 of 7,125 pitchers since 1876, and his best season by NUT was 1991 (+1.2). NUT is one number for production against league average: 0.0 is average, and every season is graded against its own league.

Career: 82-104, 4.56 ERA, 1101 K in 1595.1 IP.

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Frank Castillo Career Stats & NUT | Baseball NUT

Frank Castillo

#49

P · Albuquerque Isotopes (MIA)

Compare

CAverage

+0.9Career NUT

+1.1 to Good

Career

4.56ERA1.36WHIP82W1101K1595.1IP2SV

Career · season grades

R/R · 6' 1", 200 lb · b. Apr 1, 1969 · El Paso, TX · Draft 1989 (34th Rd, #877)

Player Overview

Year by Year


1991	22	CHC	+1.2	6	7	4.35	18	18	4	0	0	0	0	0	467	111.2	107	54	33	0	73	1.25
1992	23	CHC	+0.2	10	11	3.46	33	33	0	0	0	0	0	0	856	205.1	179	79	63	6	135	1.18
1993	24	CHC	-0.7	5	8	4.84	29	25	2	0	0	0	0	0	614	141.1	162	76	39	9	84	1.42
1994	25	CHC	—	2	1	4.30	4	4	1	0	0	0	0	0	96	23.0	25	11	5	0	19	1.30
1995	26	CHC	+0.7	11	10	3.21	29	29	2	2	0	0	0	0	795	188.0	179	67	52	6	135	1.23
1996	27	CHC	+0.2	7	16	5.28	33	33	1	1	0	0	0	0	789	182.1	209	107	46	8	139	1.40
1997	28	CHC	+0.0	6	9	5.42	20	19	0	0	0	0	0	0	446	98.0	113	59	44	4	67	1.60
1997	28	COL	-0.7	6	3	5.42	14	14	0	0	0	0	0	0	384	86.1	107	52	25	4	59	1.53
1997	28	TOT	-0.7	12	12	5.42	34	33	0	0	0	0	0	0	830	184.1	220	111	69	8	126	1.57
1998	29	DET	-0.6	3	9	6.83	27	19	0	0	4	1	0	1	531	116.0	150	88	44	5	81	1.67
2000	31	TOR	+0.2	10	5	3.59	25	24	0	0	1	0	0	0	576	138.0	112	55	56	5	104	1.22
2001	32	BOS	+0.7	10	9	4.21	26	26	0	0	0	0	0	0	580	136.2	138	64	35	5	89	1.27
2002	33	BOS	+0.0	6	15	5.07	36	23	0	0	2	1	1	2	711	163.1	174	92	58	7	112	1.42
2004	35	BOS	—	0	0	0.00	2	0	0	0	2	0	0	0	4	1.0	1	0	1	0	0	2.00
2005	36	FLA	—	0	1	10.38	1	1	0	0	0	0	0	0	22	4.1	4	5	5	0	4	2.08
Career	—	13 yrs	+0.9	82	104	4.56	297	268	10	3	9	2	1	3	6871	1595.1	1660	809	506	59	1101	1.36

Stat definitions →

NUT Breakdown

K Ability

HR Prevention

Walk Avoidance

What's driving Castillo's career NUT of +0.9

Slice size = share of total NUT. K Ability = Strikeouts · HR Prevention = HR allowed · Walk Avoidance = BB + HBP.

Career NUT Trend

1.2

91929395969798000102

NUT by Season

+1.2

+0.2

-0.7

+0.7

+0.2

-0.7

-0.6

+0.2

+0.7

+0.0

Awards

2004World Series Champion*

Minor League

Year	Age	Lv	W	L	ERA	G	GS	CG	SHO	GF	BF	IP	H	ER	BB	HBP	SO	WHIP
1988	19	A	6	1	0.71	9	8	2	2	0	186	51.0	25	4	10	1	58	0.69
1989	20	A+	9	6	2.51	18	18	8	1	0	521	129.1	118	36	24	3	114	1.10
1989	20	AA	3	4	3.84	10	10	4	0	0	283	68.0	73	29	12	1	43	1.25
1990	21	AA	6	6	3.88	18	18	4	1	0	471	111.1	113	48	27	8	112	1.26
1991	22	AAA	3	1	2.52	4	4	1	1	0	98	25.0	20	7	7	1	20	1.08
1994	25	A+	0	1	4.50	1	1	0	0	0	19	4.0	7	2	0	0	1	1.75
1994	25	AA	1	0	1.29	1	1	0	0	0	27	7.0	4	1	1	1	2	0.71
1994	25	AAA	4	2	3.27	11	11	0	0	0	266	66.0	57	24	10	5	64	1.02
1998	29	A+	1	0	0.00	1	1	0	0	0	18	5.0	2	0	0	1	4	0.40
1999	30	AAA	7	5	4.68	19	19	0	0	0	520	119.1	139	62	32	6	90	1.43
2001	32	AAA	0	0	0.00	2	2	0	0	0	29	7.2	7	0	0	0	3	0.91
2003	34	AAA	0	1	1.50	4	3	0	0	0	79	18.0	23	3	4	0	14	1.50
2003	34	AAA	5	4	4.13	19	16	0	0	2	414	96.0	104	44	34	6	59	1.44
2003	34	AAA	5	5	3.71	23	19	0	0	2	493	114.0	127	47	38	6	73	1.45
2004	35	AAA	10	9	4.38	27	25	0	0	0	693	168.1	169	82	34	5	123	1.21
2005	36	AAA	9	11	5.53	27	24	0	0	0	639	143.1	161	88	58	10	80	1.53

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