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Jackson Kowar

Seattle Mariners · RP Throws: R Bats: R Height: 6'5 Weight: 200 Born: Oct 04, 1996 (28)

Percentile Ranks
vs LHH
vs RHH K%
50.6
54.4 xWOBA
0.355 · 32%
0.355 · 17%
xSLG
24.1
11.2

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		15	0	2-0	17.0	4.24	1.24	21.1%	0.0%	9.9%	.242	.497	.355	.255	10.4%	22.9%	50%	35%	8%	44%	43%	11%	57%	55%	0.0	2.7	5.1	3.8	0.6	0.0
2023		23	0	2-0	28.0	6.43	1.93	21.2%	0.0%	14.6%	.248	.364	.329	.116	5.7%	34.5%	35%	45%	28%	23%	45%	15%	55%	49%	0.0	0.0	0.0	0.0	0.0	0.0
2022		7	0	0-0	15.2	9.77	2.50	20.7%	0.0%	13.4%	.298	.473	.380	.175	7.4%	31.5%	48%	50%	24%	20%	47%	10%	53%	54%	0.0	0.0	0.0	0.0	0.0	0.0
2021	Royals	9	8	0-6	30.1	11.27	2.09	18.8%	0.0%	13.0%	.300	.521	.396	.221	11.7%	42.7%	52%	35%	32%	29%	46%	17%	54%	45%	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		SL		CH		SI		Rating	DK $	DK	FD $	FD
1	2025	Aug, 18	@PHI	1.0	7	30	2	0	1	2	1	5	26.7										n/a	-0.15	n/a	3
2	2025	Aug, 17	@NYM	1.0	5	18	1	0	0	1	2	3	33.3										n/a	5.05	n/a	9
3	2025	Aug, 15	@NYM	0.1	4	9	3	1	3	0	1	3	44.4	55.6%	97.4	44.4%	87.2						n/a	-5.05	n/a	-5
4	2025	Aug, 14	@BAL	1.0	3	10	0	0	0	0	1	0	20.0	80.0%	97.7	10.0%	84.9	10.0%	88.7				n/a	4.25	n/a	6
5	2025	Aug, 05	CWS	1.0	5	20	2	2	2	0	1	5	30.0	45.0%	97.4	55.0%	86.3						n/a	-0.95	n/a	0
6	2025	Jul, 29	@ATH	2.0	6	16	0	0	0	0	1	1	25.0										n/a	6.50	n/a	9
7	2025	Jul, 27	@LAA	1.0	4	17	1	0	0	1	0	0	11.8										n/a	1.05	n/a	3
8	2025	Jun, 14	CLE	1.0	3	11	0	0	0	0	1	2	36.4	45.5%	95.9	45.5%	86.1			9.1%	96.0		n/a	8.25	n/a	12
9	2025	Jun, 10	@ARI	2.0	7	28	1	1	1	0	3	3	28.6	53.6%	97.1	28.6%	86.8	17.9%	86.6				n/a	7.90	n/a	12
10	2025	Jun, 07	@LAA	0.2	6	33	1	0	1	3	1	2	15.2	66.7%	96.1	9.1%	88.2	6.1%	95.5	18.2%	86.7		n/a	-0.90	n/a	2
11	2025	Jun, 06	@LAA	1.0	4	17	1	0	0	0	1	1	17.6	41.2%	96.0	47.1%	85.6			11.8%	95.5		n/a	3.65	n/a	6
12	2025	Jun, 03	BAL	2.0	6	26	0	0	0	0	1	2	19.2	57.7%	97.1	30.8%	86.8	3.8%	87.1	7.7%	96.5		n/a	6.50	n/a	9
13	2025	May, 31	MIN	1.0	4	19	1	0	0	0	0	3	26.3										n/a	1.65	n/a	3
14	2025	May, 28	WSH	1.0	4	16	1	0	0	0	1	1	12.5	56.3%	97.8	31.3%	84.9			12.5%	86.5		n/a	3.65	n/a	6

2023

Box Score														Pitch Usage/Velo								DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	FF		SL		SI		CH		Rating	DK $	DK	FD $	FD

2022

Box Score														Pitch Usage/Velo								DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	FF		SL		SI		CH		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		SL		CH		SI		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%	58%	.305	.382	14.8	7.4	.536	.160	1	59%	.237	.385	11.1	5.6	.646	.353	2
Slider	Breaking	86.2 MPH	2507	52%	37%	.162	.309	35.7	7.1	.421	.250	1	35%	.144	.258	44.4	22.2	.161	.000	0
Changeup	Offspeed	87.0 MPH	2421	0%	5%	.332	.314	0.0	0.0	.382	.500	0	5%	.000	.693	0.0	100.0	.000	.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

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
4-Seamer	Fastball	96.9 MPH	2017	22%	39%	.258	.373	19.0	28.6	.290	.067	0	38%	.202	.362	27.6	27.6	.352	.190	1
Slider	Breaking	86.0 MPH	2185	32%	13%	.167	.334	16.7	0.0	.667	.000	1	36%	.162	.203	25.8	3.2	.279	.233	2
Changeup	Offspeed	86.6 MPH	2387	26%	48%	.353	.346	15.4	3.8	.406	.000	0	26%	.267	.360	16.7	16.7	.359	.211	0

Splits	vs LHB								vs RHB
Year	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR
2025	43	.262	.355	.493	.205	20.9%	7.0%	2	28	.210	.355	.504	.250	21.4%	14.3%	2
2023	53	.318	.371	.427	.087	17.0%	13.2%	1	84	.202	.302	.322	.214	23.8%	15.5%	3
2022	28	.392	.495	.643	.364	14.3%	21.4%	2	54	.256	.320	.397	.265	24.1%	9.3%	2
2021	68	.303	.428	.599	.315	14.7%	16.2%	4	86	.297	.371	.464	.203	22.1%	10.5%	3

	Home								Road
Season	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR
2025	25	.245	.335	16.0%	0.0%	.511	.292	2	46	.241	.366	23.9%	15.2%	.489	.179	2
2023	48	.198	.235	31.3%	8.3%	.246	.068	0	89	.279	.380	15.7%	18.0%	.436	.222	4
2022	51	.337	.401	23.5%	13.7%	.488	.227	1	31	.238	.347	16.1%	12.9%	.451	.407	3
2021	86	.301	.394	19.8%	12.8%	.527	.236	4	68	.298	.400	17.6%	13.2%	.513	.268	3

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	2.67	1.35	5.00	0.00	3.33	7.20	-0.93	0.00	0.00	1.59	7.43
Home	3.66	3.82	0.00	0.00	1.35	0.00	1.05	0.00	1.35	4.22	0.00