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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%
92.4
92.2 xWOBA
0.283 · 92%
0.244 · 99%
xSLG
93.9
99.0

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		22	0	3-1	25.1	2.13	1.00	29.7%	0.0%	7.9%	.190	.326	.262	.135	4.8%	33.9%	42%	27%	26%	29%	56%	23%	44%	35%	0.0	3.9	5.8	4.0	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	0.0
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	0.0	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, 30	@SF	2.0	8	26	2	0	0	0	3	1	19.2										n/a	13.30	n/a	21
2	2025	Jul, 28	@SF	1.0	3	14	0	0	0	0	2	2	35.7										n/a	6.25	n/a	9
3	2025	Jul, 25	ARI	1.0	5	21	2	0	0	0	1	4	38.1	66.7%	94.2	14.3%	86.3	19.0%	84.5				n/a	3.05	n/a	6
4	2025	Jul, 22	DET	1.0	4	24	1	0	0	0	2	4	37.5	66.7%	95.3	20.8%	88.9	12.5%	86.4				n/a	5.65	n/a	9
5	2025	Jul, 19	CWS	0.1	5	22	2	0	2	1	1	0	27.3	86.4%	94.1	9.1%	86.8	4.5%	87.3				n/a	-3.05	n/a	-2
6	2025	Jul, 18	CWS	1.0	3	12	0	0	0	0	0	0	25.0	75.0%	94.5	8.3%	86.4	16.7%	86.5				n/a	2.25	n/a	3
7	2025	Jul, 09	@KC	1.0	6	17	2	1	1	1	1	1	23.5	76.5%	94.5	5.9%	88.6	17.6%	86.7				n/a	0.45	n/a	3
8	2025	Jul, 08	@KC	0.0	1	2	1	0	0	0	0	0	0.0	100.0%	93.0								n/a	-0.60	n/a	0
9	2025	Jul, 05	@SEA	1.1	4	24	0	0	0	0	3	4	25.0	83.3%	95.1	8.3%	88.3	8.3%	86.0				n/a	9.00	n/a	13
10	2025	Jul, 02	STL	1.0	5	19	1	0	0	1	1	2	26.3	84.2%	94.9	15.8%	87.0						n/a	3.05	n/a	6
11	2025	Jul, 01	STL	1.0	5	26	0	0	0	2	0	1	15.4	61.5%	95.0	26.9%	86.8	11.5%	85.0				n/a	5.05	n/a	9
12	2025	Jun, 27	NYM	1.1	5	21	1	0	0	0	3	3	33.3										n/a	8.40	n/a	13
13	2025	Jun, 23	@MIL	1.2	6	31	1	0	0	0	3	6	32.3										n/a	9.15	n/a	14
14	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
15	2025	Jun, 19	@DET	0.2	4	15	2	1	2	0	0	2	33.3										n/a	-3.70	n/a	-4
16	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
17	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
18	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
19	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
20	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

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

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

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%	.146	.231	40.0	16.0	.176	.200	1	75%	.174	.238	34.2	7.9	.254	.000	0
Slider	Breaking	MPH		39%	2%	.272	.385	50.0	0.0	.655	.500	0	20%	.187	.275	16.7	0.0	.476	.250	1
Changeup	Offspeed	MPH		23%	24%	.255	.332	14.3	4.8	.488	.200	1	5%	.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	48	.204	.283	.348	.214	29.2%	10.4%	2	53	.179	.244	.307	.061	30.2%	5.7%	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	5.63	4.15	9.57	0.00	4.50	8.50	6.44	0.00	0.00	6.34	4.38
Home	3.89	3.89	0.00	0.00	1.88	0.00	3.09	0.00	3.85	3.90	0.00