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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%
72.9
66.7 xWOBA
0.382 · 10%
0.332 · 33%
xSLG
8.5
12.8

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		7	0	1-0	8.2	2.08	0.98	23.5%	0.0%	8.8%	.239	.520	.364	.282	9.1%	13.6%	59%	27%	5%	50%	43%	15%	57%	38%	0.0	2.7	5.1	0.0	0.0	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	10.1	2.0	0.0	1.5	2.9
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%	-5.7	0.0	14.5	0.3	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	-2.4	0.0	0.0	3.0

2025

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
1	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
2	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
3	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
4	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
5	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
6	2025	May, 31	MIN	1.0	4	19	1	0	0	0	0	3	26.3										n/a	1.65	n/a	3
7	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		CH		SI		Rating	DK $	DK	FD $	FD
8	2023	Sep, 26	@DET	0.1	3	17	2	0	1	1	0	1	17.6										n/a	-3.05	n/a	-2
9	2023	Sep, 22	@HOU	0.1	5	18	3	1	3	1	0	0	16.7										n/a	-7.65	n/a	-8
10	2023	Sep, 18	CLE	1.0	4	15	1	0	0	0	2	2	13.3										n/a	9.65	n/a	15
11	2023	Sep, 17	HOU	1.0	3	11	0	0	0	0	1	2	36.4										n/a	4.25	n/a	6
12	2023	Sep, 12	@CWS	1.2	6	23	0	0	0	1	2	5	39.1										n/a	7.15	n/a	11
13	2023	Sep, 10	@TOR	0.2	4	17	2	0	0	0	0	1	23.5										n/a	0.30	n/a	2
14	2023	Sep, 05	CWS	1.0	3	12	0	0	0	0	1	0	33.3										n/a	8.25	n/a	12
15	2023	Sep, 02	BOS	2.0	10	37	3	0	1	1	2	4	32.4										n/a	4.10	n/a	9
16	2023	Aug, 30	PIT	1.0	3	10	0	0	0	0	1	2	40.0										n/a	4.25	n/a	6
17	2023	Aug, 28	PIT	1.0	4	16	2	0	1	0	1	4	37.5										n/a	1.05	n/a	3
18	2023	Aug, 26	@SEA	2.0	12	44	3	1	4	3	1	1	25.0										n/a	-5.10	n/a	-3
19	2023	Aug, 23	@OAK	0.1	4	21	0	0	0	3	0	2	19.0										n/a	-1.05	n/a	1
20	2023	Aug, 19	@CHC	1.0	3	10	0	0	0	0	0	1	20.0										n/a	2.25	n/a	3
21	2023	Aug, 17	SEA	1.1	5	35	1	0	0	1	3	4	25.7										n/a	7.80	n/a	13
22	2023	Jun, 23	@TB	1.0	8	28	5	0	3	0	2	3	17.9										n/a	-2.75	n/a	0
23	2023	Jun, 21	@DET	1.0	9	31	4	0	0	0	1	6	25.8										n/a	1.85	n/a	6
24	2023	Jun, 21	KC	1.0	9	31	4	0	0	0	1	6	25.8										n/a	1.85	n/a	6
25	2023	Jun, 17	@KC	1.0	5	24	1	0	1	1	1	4	33.3										n/a	1.05	n/a	3
26	2023	Jun, 17	LAA	1.0	5	24	1	0	1	1	1	4	33.3										n/a	1.05	n/a	3
27	2023	Jun, 13	CIN	1.0	4	20	0	0	0	1	1	2	35.0										n/a	3.65	n/a	6

2022

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
28	2022	Jul, 29	@NYY	0.1	5	18	2	1	2	2	0	1	22.2										n/a	-5.65	n/a	-5
29	2022	Jul, 14	@TOR	2.0	8	27	2	0	0	0	2	5	37.0										n/a	7.30	n/a	12
30	2022	Jul, 09	CLE	2.2	16	60	7	1	5	3	3	5	25.0										n/a	-4.00	n/a	2
31	2022	Jul, 09	@KC	2.2	16	60	7	1	5	3	3	5	25.0										n/a	-4.00	n/a	2
32	2022	Jul, 05	@HOU	3.0	15	58	3	2	3	2	3	5	22.4										n/a	3.75	n/a	9
33	2022	Jul, 03	@DET	1.0	3	15	0	0	0	0	0	1	13.3										n/a	2.25	n/a	3
34	2022	Jul, 03	KC	1.0	3	15	0	0	0	0	0	1	13.3										n/a	2.25	n/a	3
35	2022	Jun, 27	TEX	3.1	14	62	2	0	0	3	5	10	33.9										n/a	14.50	n/a	25
36	2022	Apr, 10	CLE	3.1	21	71	11	0	7	1	4	5	31.0										n/a	-5.70	n/a	1

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
37	2021	Sep, 27	@Cle	4.1	22	84	7	0	5	1	4	8	27.4										n/a	2.95	n/a	10
38	2021	Jun, 19	BOS	3.0	12	42	3	1	2	0	1	4	23.8										n/a	2.95	n/a	6
39	2021	Jun, 12	KC	1.1	12	57	5	0	4	3	1	0	17.5										n/a	-7.80	n/a	-5

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%	60%	.343	.478	15.4	7.7	.752	.250	1	65%	.098	.236	14.3	14.3	.287	.000	0
Slider	Breaking	86.3 MPH	2479	44%	32%	.147	.223	42.9	0.0	.166	.000	0	24%	.000	.000	100.0	0.0	.000	.000	0
Changeup	Offspeed	87.0 MPH	2415	0%	9%	.332	.314	0.0	0.0	.382	.500	0	11%	.000	.692	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	MPH		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	22	.283	.382	.539	.200	22.7%	4.5%	1	12	.150	.332	.483	.000	25.0%	16.7%	0
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	17	.236	.267	17.6%	0.0%	.313	.063	0	17	.241	.461	29.4%	17.6%	.757	.214	1
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	3.03	2.23	4.50	0.00	3.79	7.90	-2.75	0.00	0.00	2.37	7.90
Home	4.17	5.01	0.00	0.00	3.65	0.00	1.05	0.00	1.35	5.51	0.00