Isaac Mattson

Position: Relief Pitcher

Bats: Right • Throws: Right

6-2, 214lb (188cm, 97kg)

Born: July 14, 1995 in Erie, PA us

Draft: Drafted by the Los Angeles Angels in the 19th round of the 2017 MLB June Amateur Draft from University of Pittsburgh (Pittsburgh, PA).

School: University of Pittsburgh (Pittsburgh, PA)

Rookie Status: Exceeded rookie limits during 2025 season

2026 Contract Status: Pre-Arb Eligible

Service Time (01/2026): 0.161 • Arb Eligible: 2028 • Free Agent: 2032

Full Name: Isaac Gerald Mattson

View Player Info from the B-R Bullpen

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SUMMARY

2026

Career

WAR

0.2

1.8

ERA

4.66

3.54

29.0

86.1

WHIP

1.414

1.286

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Year	Age	AgeDif	Tm	Lg	Lev	Aff	W	L	W-L%	ERA	RA9	G	GS	GF	CG	SHO	SV	IP	H	R	ER	HR	BB	IBB	SO	HBP	BK	WP	BF	WHIP	H9	HR9	BB9	SO9	SO/W
2015	19	-1.4	Pittsburgh	ACC	NCAA		1	1	.500	3.82	4.70	22	1			0	0	30.2	25	16	13	3	5	0	37	3	0	3	126	0.978	7.3	0.9	1.5	10.9	7.40
2015	19	-0.8	Baltimore Redbirds	CRCL	Smr		2	1	.667	0.00	0.50	11	0	9	0	0	2	18.0	7	1	0	0	5	0	35	2	0	0	68	0.667	3.5	0.0	2.5	17.5	7.00
2016	20	-0.6	Pittsburgh	ACC	NCAA		2	0	1.000	3.71	4.50	17	0		0	0	1	34.0	33	17	14	4	5	0	31	2	0	3	141	1.118	8.7	1.1	1.3	8.2	6.20
2016	20	-0.1	Chatham	CCBL	Smr		2	1	.667	1.21	1.21	13	0	1	0	0	1	29.2	27	4	4	0	5	2	24	1	0	0	116	1.079	8.2	0.0	1.5	7.3	4.80
2017	21	0.4	Pittsburgh	ACC	NCAA		1	0	1.000	2.87	2.87	21	0		0	0	4	31.1	25	10	10	3	9	0	41	3	0	1	123	1.085	7.2	0.9	2.6	11.8	4.56
2017	21		2 Teams	2 Lgs	Rk	LAA	1	0	1.000	1.44	1.44	20	0	10	0	0	7	31.1	19	5	5	4	11	1	47	1	0	2	121	0.957	5.5	1.1	3.2	13.5	4.27
2017	21	-0.4	Orem	PION	Rk	LAA	1	0	1.000	1.35	1.35	17	0	8	0	0	6	26.2	16	4	4	4	10	1	40	1	0	0	103	0.975	5.4	1.4	3.4	13.5	4.00
2017	21	0.3	Angels	ARIZ	Rk	LAA	0	0		1.93	1.93	3	0	2	0	0	1	4.2	3	1	1	0	1	0	7	0	0	2	18	0.857	5.8	0.0	1.9	13.5	7.00
2018	22		2 Teams	2 Lgs	A-A+	LAA	7	4	.636	3.82	4.01	25	11	8	0	0	2	94.1	89	42	40	3	31	0	85	5	0	2	398	1.272	8.5	0.3	3.0	8.1	2.74
2018	22	-1.2	Inland Empire	CALL	A+	LAA	2	1	.667	3.62	4.10	11	0	7	0	0	2	37.1	30	17	15	2	12	0	39	2	0	1	155	1.125	7.2	0.5	2.9	9.4	3.25
2018	22	0.1	Burlington	MIDW	A	LAA	5	3	.625	3.95	3.95	14	11	1	0	0	0	57.0	59	25	25	1	19	0	46	3	0	1	243	1.368	9.3	0.2	3.0	7.3	2.42
2019	23		3 Teams	3 Lgs	AA-A+-AAA	LAA	6	3	.667	2.33	2.82	37	0	17	0	0	1	73.1	47	23	19	4	27	0	110	3	0	2	292	1.009	5.8	0.5	3.3	13.5	4.07
2019	23	-3.7	Salt Lake	PCL	AAA	LAA	0	0		3.86	3.86	5	0	2	0	0	1	9.1	9	4	4	0	5	0	19	0	0	0	42	1.500	8.7	0.0	4.8	18.3	3.80
2019	23	-1.3	Mobile	SOUL	AA	LAA	3	3	.500	2.68	3.30	24	0	10	0	0	0	43.2	30	16	13	3	13	0	61	3	0	1	174	0.985	6.2	0.6	2.7	12.6	4.69
2019	23	-0.2	Inland Empire	CALL	A+	LAA	3	0	1.000	0.89	1.33	8	0	5	0	0	0	20.1	8	3	2	1	9	0	30	0	0	1	76	0.836	3.5	0.4	4.0	13.3	3.33
2019	23	-0.2	Mesa	AZFL	Fal		0	2	.000	1.69	2.53	7	0	1	0	0	0	10.2	9	3	2	1	3	0	12	0	0	2	42	1.125	7.6	0.8	2.5	10.1	4.00

2021	25	-2.0	Norfolk	AAAE	AAA	BAL	0	2	.000	6.23	6.75	18	0	6	0	0	2	17.1	24	13	12	3	6	0	24	1	0	2	81	1.731	12.5	1.6	3.1	12.5	4.00
2021	25	-3.5	BAL	AL	Maj	BAL	0	0		6.23	6.23	4	0	3	0	0	0	4.1	5	3	3	0	5	0	3	0	0	1	23	2.308	10.4	0.0	10.4	6.2	0.60
2022	26	-1.0	Norfolk	IL	AAA	BAL	1	0	1.000	6.62	6.62	19	0	6	0	0	0	17.2	12	13	13	4	20	0	14	4	0	2	86	1.811	6.1	2.0	10.2	7.1	0.70
2022	26	0.5	Washington	FRON	Ind		1	0	1.000	2.51	2.51	12	0		0		1	14.1	10	4	4	2	6		23					1.116	6.3	1.3	3.8	14.4	3.83
2023	27	2.4	Wichita	TL	AA	MIN	3	1	.750	3.62	4.18	21	1	5	0	0	0	32.1	15	15	13	3	24	0	42	4	0	3	139	1.206	4.2	0.8	6.7	11.7	1.75
2023	27	-1.9	Southern Maryland	ATLL	Ind		1	1	.500	3.32	3.32	18	0	6	0	0	3	19.0	12	7	7	2	8	0	24	0	0	0	74	1.053	5.7	0.9	3.8	11.4	3.00
2024	28		2 Teams	2 Lgs	AAA-AA	PIT	7	2	.778	3.17	3.68	37	3	15	0	0	4	71.0	54	29	25	7	38	0	89	0	0	1	299	1.296	6.8	0.9	4.8	11.3	2.34
2024	28	1.0	Indianapolis	IL	AAA	PIT	5	1	.833	3.15	3.75	29	3	9	0	0	3	60.0	45	25	21	6	33	0	76	0	0	0	255	1.300	6.8	0.9	5.0	11.4	2.30
2024	28	3.5	Altoona	EL	AA	PIT	2	1	.667	3.27	3.27	8	0	6	0	0	1	11.0	9	4	4	1	5	0	13	0	0	1	44	1.273	7.4	0.8	4.1	10.6	2.60
2024	28	-1.1	PIT	NL	Maj	PIT	0	0		5.06	5.06	3	0	1	0	0	0	5.1	1	3	3	0	5	0	6	1	0	0	23	1.125	1.7	0.0	8.4	10.1	1.20
2025	29	1.7	Indianapolis	IL	AAA	PIT	2	0	1.000	2.57	3.43	19	0	13	0	0	4	21.0	14	8	6	1	6	0	25	0	0	1	84	0.952	6.0	0.4	2.6	10.7	4.17
2025	29	-0.1	PIT	NL	Maj	PIT	3	3	.500	2.45	2.64	44	0	12	0	0	0	47.2	35	14	13	4	19	2	45	2	0	0	198	1.133	6.6	0.8	3.6	8.5	2.37
2026	30	2.7	Indianapolis	IL	AAA	PIT	1	0	1.000	1.86	1.86	9	1	4	0	0	0	9.2	8	2	2	0	6	0	11	0	0	2	42	1.448	7.4	0.0	5.6	10.2	1.83
2026	30	0.7	PIT	NL	Maj	PIT	0	0		4.66	4.66	30	0	5	0	0	0	29.0	28	15	15	3	13	0	25	1	0	1	126	1.414	8.7	0.9	4.0	7.8	1.92
Year	Age	AgeDif	Tm	Lg	Lev	Aff	W	L	W-L%	ERA	RA9	G	GS	GF	CG	SHO	SV	IP	H	R	ER	HR	BB	IBB	SO	HBP	BK	WP	BF	WHIP	H9	HR9	BB9	SO9	SO/W
Majors (4 seasons)					Majors		3	3	.500	3.54	3.65	81	0	21	0	0	0	86.1	69	35	34	7	42	2	79	4	0	2	370	1.286	7.2	0.7	4.4	8.2	1.88
Minors (9 seasons)					Minors		28	12	.700	3.30	3.67	205	16	84	0	0	20	368.0	282	150	135	29	169	1	447	18	0	17	1542	1.226	6.9	0.7	4.1	10.9	2.65
College (3 seasons)					College		4	1	.800	3.47	4.03	60	1		0	0	5	96.0	83	43	37	10	19	0	109	8	0	7	390	1.063	7.8	0.9	1.8	10.2	5.74
Other (5 seasons)					Other		6	5	.545	1.67	1.87	61	0	17	0	0	7	91.2	65	19	17	5	27	2	118	3	0	2	300	1.004	6.4	0.5	2.7	11.6	4.37
All Levels (11 Seasons)							41	21	.661	3.13	3.46	407	17	122	0	0	32	642.0	499	247	223	51	257	5	753	33	0	28	2602	1.178	7.0	0.7	3.6	10.6	2.93

AAA (6 seasons)					Minors		9	3	.750	3.87	4.33	99	4	40	0	0	10	135.0	112	65	58	14	76	0	169	5	0	7	590	1.393	7.5	0.9	5.1	11.3	2.22
AA (3 seasons)					Minors		8	5	.615	3.10	3.62	53	1	21	0	0	1	87.0	54	35	30	7	42	0	116	7	0	5	357	1.103	5.6	0.7	4.3	12.0	2.76
A+ (2 seasons)					Minors		5	1	.833	2.65	3.12	19	0	12	0	0	2	57.2	38	20	17	3	21	0	69	2	0	2	231	1.023	5.9	0.5	3.3	10.8	3.29
A (1 season)					Minors		5	3	.625	3.95	3.95	14	11	1	0	0	0	57.0	59	25	25	1	19	0	46	3	0	1	243	1.368	9.3	0.2	3.0	7.3	2.42
Rk (1 season)					Minors		1	0	1.000	1.44	1.44	20	0	10	0	0	7	31.1	19	5	5	4	11	1	47	1	0	2	121	0.957	5.5	1.1	3.2	13.5	4.27
Fal (1 season)					Other		0	2	.000	1.69	2.53	7	0	1	0	0	0	10.2	9	3	2	1	3	0	12	0	0	2	42	1.125	7.6	0.8	2.5	10.1	4.00
Ind (2 seasons)					Other		2	1	.667	2.97	2.97	30	0	6	0	0	4	33.1	22	11	11	4	14	0	47	0	0	0	74	1.080	5.9	1.1	3.8	12.7	3.36
Smr (2 seasons)					Other		4	2	.667	0.76	0.94	24	0	10	0	0	3	47.2	34	5	4	0	10	2	59	3	0	0	184	0.923	6.4	0.0	1.9	11.1	5.90