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Justin Slaten

Boston Red Sox · RP Throws: R Bats: R Height: 6'4 Weight: 222 Born: )

Percentile Ranks
vs LHH
vs RHH K%
20.2
37.9 xWOBA
0.301 · 85%
0.290 · 86%
xSLG
93.9
48.3

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		36	0	2-4	34.0	4.24	1.09	18.2%	0.0%	7.3%	.239	.398	.295	.159	7.8%	32.4%	34%	41%	24%	28%	55%	21%	45%	49%	3.5	2.5	0.0	0.0	3.1	1.6
2024		44	0	6-2	55.1	2.93	1.02	25.9%	0.0%	4.0%	.233	.347	.278	.114	3.9%	30.3%	37%	50%	23%	19%	51%	17%	49%	55%	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%	ST		FC		FF		CU		Rating	DK $	DK	FD $	FD
1	2025	Oct, 02	202	1.1	5	11	0	0	0	0	1	1	18.2										n/a	5.00	n/a	7
2	2025	Sep, 26	DET	0.2	3	11	0	0	0	1	0	2	18.2										n/a	0.90	n/a	2
3	2025	Sep, 23	@TOR	1.0	3	13	0	0	0	0	0	1	30.8										n/a	2.25	n/a	3
4	2025	Sep, 20	@TB	0.1	2	6	1	0	0	0	0	0	16.7										n/a	0.15	n/a	1
5	2025	Sep, 19	@TB	1.0	3	12	0	0	0	0	2	5	50.0										n/a	6.25	n/a	9
6	2025	Sep, 17	ATH	1.1	4	15	0	0	0	0	1	5	40.0										n/a	5.00	n/a	7
7	2025	Sep, 16	ATH	1.0	3	5	0	0	0	0	0	1	40.0										n/a	2.25	n/a	3
8	2025	Sep, 10	@ATH	0.1	4	10	2	0	2	1	0	0	10.0										n/a	-5.05	n/a	-5
9	2025	Sep, 09	@ATH	1.0	5	18	2	0	0	0	1	3	22.2										n/a	3.05	n/a	6
10	2025	Sep, 05	@ARI	1.0	7	18	4	1	4	0	1	3	27.8										n/a	-6.15	n/a	-6
11	2025	Sep, 02	CLE	1.0	4	12	1	0	0	0	1	2	33.3										n/a	7.65	n/a	12
12	2025	Aug, 31	PIT	1.0	4	23	1	1	1	0	2	4	26.1										n/a	3.65	n/a	6
13	2025	Aug, 29	PIT	1.0	5	23	2	0	0	1	1	3	26.1										n/a	2.45	n/a	6
14	2025	May, 28	@MIL	0.1	3	16	1	0	0	0	0	0	6.3			31.3%	92.2	25.0%	96.5	43.8%	85.1		n/a	0.15	n/a	1
15	2025	May, 27	@MIL	1.1	5	20	0	0	0	1	1	3	30.0	10.0%	85.5	45.0%	93.3	20.0%	97.5	25.0%	85.6		n/a	4.40	n/a	7
16	2025	May, 24	BAL	1.0	4	20	1	0	0	1	0	0	25.0			60.0%	93.8	30.0%	97.8	10.0%	85.8		n/a	1.05	n/a	3
17	2025	May, 23	BAL	0.2	3	8	1	0	0	0	1	2	25.0			37.5%	93.9	12.5%	97.5	50.0%	84.6	23.00	4,000	2.90	n/a	5
18	2025	May, 20	NYM	1.2	4	12	0	0	0	0	0	0	8.3	8.3%	85.5	33.3%	94.2	25.0%	97.3	33.3%	83.2		n/a	3.75	n/a	5
19	2025	May, 19	NYM	1.1	4	12	0	0	0	0	1	0	25.0	16.7%	84.2	66.7%	92.8			16.7%	84.0		n/a	5.00	n/a	7
20	2025	May, 14	@DET	1.0	3	11	0	0	0	0	1	2	45.5			18.2%	93.0	36.4%	98.8	45.5%	85.3		n/a	4.25	n/a	6

2024

Box Score														Pitch Usage/Velo								DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	ST		FC		FF		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%	51%	.196	.270	14.3	14.3	.266	.000	0	37%	.156	.244	33.3	11.1	.292	.063	0
Cutter	Fastball	92.7 MPH	2600	23%	47%	.210	.247	17.6	5.9	.302	.000	0	43%	.374	.431	0.0	0.0	.682	.120	1
Sweeper	Breaking	MPH		39%	2%	.090	.088	50.0	0.0	.099	.000	0	20%	.208	.240	33.3	0.0	.355	.167	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%	39%	.129	.187	38.7	6.5	.176	.000	0	26%	.191	.240	22.2	3.7	.278	.040	0
Cutter	Fastball	91.5 MPH	2427	24%	47%	.319	.374	14.6	7.3	.485	.184	1	37%	.248	.246	15.4	0.0	.313	.026	0
Sweeper	Breaking	MPH		36%	14%	.276	.389	27.8	16.7	.494	.200	1	38%	.251	.309	27.1	0.0	.413	.174	2

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	59	.238	.301	.361	.057	16.9%	10.2%	1	76	.240	.290	.426	.123	19.7%	2.6%	2
2024	105	.235	.293	.357	.104	29.5%	7.6%	2	119	.232	.266	.339	.087	22.7%	0.8%	2

	Home								Road
Season	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR
2025	60	.202	.243	18.3%	5.0%	.310	.070	1	75	.270	.336	18.7%	6.7%	.472	.116	2
2024	99	.249	.294	24.2%	4.0%	.383	.138	2	125	.221	.266	27.2%	4.0%	.318	.060	2

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	3.01	2.34	2.51	0.00	2.58	3.04	2.40	0.00	3.26	2.56	0.78
Home	4.01	3.17	6.07	0.00	4.28	5.95	4.70	0.00	3.71	4.59	2.90