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Isaac Mattson

Pittsburgh Pirates · RP Throws: R Bats: R Height: 6'2 Weight: 215 Born: Jul 14, 1995 (30)

Percentile Ranks
vs LHH
vs RHH K%
96.6
79.5 xWOBA
0.267 · 95%
0.264 · 96%
xSLG
94.9
85.9

Year	Team	G	GS	W-L	IP	ERA	WHIP	K%	CSW%	BB%	xAVG	xSLG	xwOBA	xISO	BAR%	SS%	HH%	GB%	LD%	FB%	Z%	Z Sw%	OZ%	OZ Sw%	Apr	May	Jun	Jul	Aug	Sep
2025		18	0	2-1	20.1	2.66	1.00	27.2%	0.0%	9.9%	.192	.356	.283	.164	6.0%	36.0%	44%	24%	26%	32%	55%	21%	45%	28%	0.0	3.9	5.8	2.3	0.0	0.0
2024		3	0	0-0	5.1	5.06	1.18	26.1%	0.0%	21.7%	.225	.330	.359	.106	9.1%	36.4%	27%	55%	18%	18%	48%	19%	52%	36%	0.0	0.0	0.0	0.0	0.0	4.8
2021	null	4	0	0-0	4.1	6.23	2.44	13.0%	0.0%	21.7%	.226	.532	.397	.306	13.3%	26.7%	47%	33%	7%	53%	43%	18%	57%	39%	0.0	-1.7	0.0	0.0	0.0	0.0

2025

Box Score														Pitch Usage/Velo								DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	FF		CH		SL		CU		Rating	DK $	DK	FD $	FD
1	2025	Jul, 19	CWS	0.1	5	22	2	0	2	1	1	0	27.3										n/a	-3.05	n/a	-2
2	2025	Jul, 18	CWS	1.0	3	12	0	0	0	0	0	0	25.0										n/a	2.25	n/a	3
3	2025	Jul, 09	@KC	1.0	6	17	2	1	1	1	1	1	23.5										n/a	0.45	n/a	3
4	2025	Jul, 08	@KC	0.0	1	2	1	0	0	0	0	0	0.0										n/a	-0.60	n/a	0
5	2025	Jul, 05	@SEA	1.1	4	24	0	0	0	0	3	4	25.0										n/a	9.00	n/a	13
6	2025	Jul, 02	STL	1.0	5	19	1	0	0	1	1	2	26.3										n/a	3.05	n/a	6
7	2025	Jul, 01	STL	1.0	5	26	0	0	0	2	0	1	15.4										n/a	5.05	n/a	9
8	2025	Jun, 27	NYM	1.1	5	21	1	0	0	0	3	3	33.3										n/a	8.40	n/a	13
9	2025	Jun, 23	@MIL	1.2	6	31	1	0	0	0	3	6	32.3										n/a	9.15	n/a	14
10	2025	Jun, 20	TEX	1.1	5	16	1	0	0	1	1	2	25.0									24.40	10,000	3.80	n/a	7
11	2025	Jun, 19	@DET	0.2	4	15	2	1	2	0	0	2	33.3										n/a	-3.70	n/a	-4
12	2025	Jun, 15	@CHC	2.0	6	19	0	0	0	0	0	1	21.1	63.2%	94.9	31.6%	88.2	5.3%	86.6				n/a	4.50	n/a	6
13	2025	Jun, 12	@CHC	1.2	6	20	0	0	0	1	1	0	20.0	80.0%	94.9	10.0%	88.5	10.0%	87.5				n/a	5.15	n/a	8
14	2025	Jun, 10	MIA	2.0	6	21	0	0	0	0	3	4	42.9	57.1%	94.8	9.5%	87.7	33.3%	85.7				n/a	10.50	n/a	15
15	2025	Jun, 07	PHI	1.0	3	15	0	0	0	0	1	1	40.0	46.7%	95.4	13.3%	86.0	26.7%	84.3				n/a	8.25	n/a	12
16	2025	May, 25	MIL	1.1	5	21	0	0	0	1	1	3	33.3	66.7%	92.5	23.8%	84.2	4.8%	84.4	4.8%	81.0		n/a	4.40	n/a	7
17	2025	May, 23	MIL	0.2	2	6	0	0	0	0	1	3	50.0	66.7%	92.7			33.3%	84.4				n/a	3.50	n/a	5
18	2025	May, 22	MIL	1.0	4	20	1	1	1	0	2	1	35.0	80.0%	92.2	15.0%	84.0			5.0%	81.0		n/a	3.65	n/a	6

2024

Box Score														Pitch Usage/Velo								DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	FF		CH		SL		CU		Rating	DK $	DK	FD $	FD
19	2024	Sep, 29	@NYY	2.0	7	37	0	0	0	1	3	6	29.7	64.9%	95.1	32.4%	86.4	2.7%	88.7				n/a	9.90	n/a	15
20	2024	Sep, 24	MIL	1.1	10	38	1	0	3	4	1	2	18.4	73.7%	94.1	15.8%	85.0	10.5%	86.1				n/a	-4.00	n/a	-2
21	2024	Sep, 20	@CIN	2.0	6	25	0	0	0	0	2	2	32.0	72.0%	94.0	20.0%	85.2	8.0%	87.5				n/a	8.50	n/a	12

2021

Box Score														Pitch Usage/Velo								DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	FF		CH		SL		CU		Rating	DK $	DK	FD $	FD
22	2021	May, 07	BOS	0.2	4	18	1	0	1	1	0	1	27.8										n/a	-1.70	n/a	-1

2025 Splits				vs LHB									vs RHB
Pitch	Type	MPH	SPIN	Whiff%	Usage	xBAVG	xWOBA	K%	BB%	xSLG	ISO	HR	Usage	xBAVG	xWOBA	K%	BB%	xSLG	ISO	HR
4-Seamer	Fastball	MPH		0%	74%	.104	.230	42.9	21.4	.136	.364	1	74%	.167	.239	35.7	10.7	.267	.000	0
Slider	Breaking	85.4 MPH	2085	31%	1%	.000	.000	100.0	0.0	.000	.000	0	19%	.248	.366	0.0	0.0	.634	.333	1
Changeup	Offspeed	86.2 MPH	1726	21%	25%	.213	.311	16.7	5.6	.477	.235	1	6%	.201	.190	33.3	0.0	.233	.000	0

2024 Splits				vs LHB									vs RHB
Pitch	Type	MPH	SPIN	Whiff%	Usage	xBAVG	xWOBA	K%	BB%	xSLG	ISO	HR	Usage	xBAVG	xWOBA	K%	BB%	xSLG	ISO	HR
4-Seamer	Fastball	MPH		0%	61%	.061	.163	33.3	16.7	.063	.000	0	78%	.373	.499	16.7	33.3	.450	.000	0
Slider	Breaking	MPH		0%	7%	.000	.000	0.0	0.0	.000	.000	0	7%	.000	.000	0.0	0.0	.000	.000	0
Changeup	Offspeed	85.1 MPH	1711	43%	33%	.225	.322	50.0	0.0	.536	.000	0	15%	.001	.000	0.0	0.0	.001	.000	0

2023 Splits				vs LHB									vs RHB
Pitch	Type	MPH	SPIN	Whiff%	Usage	xBAVG	xWOBA	K%	BB%	xSLG	ISO	HR	Usage	xBAVG	xWOBA	K%	BB%	xSLG	ISO	HR

Splits	vs LHB								vs RHB
Year	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR
2025	33	.164	.267	.331	.276	30.3%	12.1%	2	40	.189	.264	.353	.081	27.5%	7.5%	1
2024	10	.134	.227	.273	.000	40.0%	10.0%	0	13	.327	.461	.394	.000	15.4%	30.8%	0
2021	8	.750	.600	.634	3.100	3.0%	0.6%	0	15	.147	.249	.285	.000	20.0%	13.3%	0

	Home								Road
Season	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR
2025	40	.170	.263	32.5%	12.5%	.308	.114	1	33	.188	.268	24.2%	6.1%	.384	.226	2
2024	10	.134	.227	40.0%	10.0%	.273	.000	0	13	.189	.256	38.5%	7.7%	.332	.000	0
2021	11	.371	.588	18.2%	27.3%	.968	.125	0	12	.110	.222	8.3%	16.7%	.183	.000	0

Split	Games	Wind 0-9 mph+	Wind 10+ mph	Humid 0-25	Humid 25-50	Humid 50-75	Humid 75-100	Temp 0-40	Temp 40-60	Temp 61-79	Temp 80+
Road	4.71	4.15	9.15	0.00	4.50	8.50	3.10	0.00	0.00	4.97	4.38
Home	3.82	3.82	0.00	0.00	0.00	0.00	3.10	0.00	3.85	3.81	0.00