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Isaac Mattson

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

Percentile Ranks
vs LHH
vs RHH K%
41.4
75.9 xWOBA
0.369 · 17%
0.226 · 100%
xSLG
36.4
98.6

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		44	0	3-3	47.2	2.45	1.14	22.7%	0.0%	9.6%	.217	.373	.290	.157	6.1%	33.3%	39%	29%	22%	33%	54%	21%	46%	31%	0.0	3.9	5.8	4.0	3.0	1.2
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	Sep, 26	@ATL	1.0	5	16	2	0	1	0	0	2	25.0										n/a	-0.95	n/a	0
2	2025	Sep, 24	@CIN	0.2	4	16	1	1	1	1	0	1	18.8										n/a	-1.70	n/a	-1
3	2025	Sep, 23	@CIN	1.0	3	12	1	0	0	0	0	1	16.7										n/a	1.65	n/a	3
4	2025	Sep, 19	ATH	1.0	3	12	0	0	0	0	0	0	16.7										n/a	2.25	n/a	3
5	2025	Sep, 14	@WSH	2.0	8	26	1	0	0	1	1	1	11.5										n/a	5.30	n/a	9
6	2025	Sep, 10	@BAL	1.0	6	23	3	0	1	0	0	1	8.7										n/a	-1.55	n/a	0
7	2025	Sep, 09	@BAL	1.0	5	15	0	0	0	2	1	3	26.7										n/a	3.05	n/a	6
8	2025	Sep, 07	MIL	1.0	5	20	0	0	0	2	1	3	25.0										n/a	3.05	n/a	6
9	2025	Sep, 03	LAD	1.0	3	12	0	0	0	0	1	2	41.7										n/a	4.25	n/a	6
10	2025	Sep, 02	LAD	1.0	6	23	3	0	2	0	0	2	34.8										n/a	-3.55	n/a	-3
11	2025	Aug, 29	@BOS	1.0	4	12	1	0	0	0	1	1	25.0										n/a	3.65	n/a	6
12	2025	Aug, 27	@STL	1.0	3	8	0	0	0	0	1	2	50.0										n/a	4.25	n/a	6
13	2025	Aug, 26	@STL	1.0	3	20	0	0	0	0	1	1	15.0										n/a	4.25	n/a	6
14	2025	Aug, 24	COL	1.0	3	9	0	0	0	0	1	1	33.3										n/a	4.25	n/a	6
15	2025	Aug, 17	@CHC	1.0	6	19	2	0	1	1	0	2	10.5										n/a	-1.55	n/a	0
16	2025	Aug, 15	@CHC	1.2	8	34	2	0	0	1	1	3	23.5	73.5%	95.4	2.9%	86.5	20.6%	85.9				n/a	3.95	n/a	8
17	2025	Aug, 13	@MIL	1.0	3	14	0	0	0	0	1	1	14.3	85.7%	95.3			14.3%	86.8				n/a	4.25	n/a	6
18	2025	Aug, 10	CIN	0.2	3	13	0	0	0	1	1	1	15.4	100.0%	93.9								n/a	2.90	n/a	5
19	2025	Aug, 09	CIN	1.0	3	13	0	0	0	0	2	1	23.1	84.6%	93.5	7.7%	86.8	7.7%	87.0				n/a	6.25	n/a	9
20	2025	Aug, 06	SF	0.1	4	13	2	0	1	1	0	3	30.8	100.0%	93.8								n/a	-3.05	n/a	-2

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%	79%	.226	.360	25.5	20.0	.395	.171	1	79%	.167	.211	29.6	5.6	.254	.000	0
Slider	Breaking	85.0 MPH	2088	30%	2%	.272	.385	50.0	0.0	.655	.500	0	17%	.137	.191	20.0	0.0	.320	.150	1
Changeup	Offspeed	86.0 MPH	1720	20%	19%	.300	.368	11.1	3.7	.536	.154	1	4%	.159	.149	20.0	0.0	.179	.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	91	.269	.369	.459	.173	19.8%	14.3%	2	104	.178	.226	.310	.063	25.0%	3.8%	2
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	91	.202	.280	26.4%	11.0%	.312	.077	1	104	.231	.302	19.2%	6.7%	.429	.140	3
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	3.76	2.93	9.57	3.65	4.31	8.50	2.69	0.00	0.00	3.61	4.18
Home	3.22	3.22	0.00	0.00	2.00	0.00	3.09	0.00	3.65	3.13	0.00