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Zack Kelly

Boston Red Sox · RP Throws: R Bats: R Height: 6'4 Weight: 231 Born: )

Percentile Ranks
vs LHH
vs RHH K%
15.2
90.3 xWOBA
0.252 · 99%
0.328 · 41%
xSLG
100.0
50.3

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		28	0	1-3	35.1	4.58	1.34	23.0%	0.0%	7.9%	.236	.354	.293	.118	4.9%	37.3%	31%	43%	26%	25%	52%	19%	48%	34%	2.4	1.3	4.0	0.0	0.0	3.3
2024		49	3	6-3	56.2	3.97	1.26	25.3%	0.0%	11.2%	.227	.411	.318	.184	9.9%	35.1%	31%	48%	21%	25%	49%	21%	51%	45%	0.0	0.0	0.0	0.0	0.0	0.0
2023		8	0	0-0	9.1	3.86	1.65	14.0%	0.0%	18.6%	.225	.381	.362	.156	7.7%	30.8%	46%	54%	19%	27%	43%	21%	58%	26%	0.0	0.0	0.0	0.0	0.0	0.0
2022		13	0	1-0	13.2	3.95	1.36	18.6%	0.0%	6.8%	.198	.343	.260	.144	6.8%	29.5%	25%	46%	14%	32%	54%	12%	46%	38%	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		SI		FC		ST		Rating	DK $	DK	FD $	FD
1	2025	Sep, 28	DET	1.0	3	6	0	0	0	0	0	0	16.7												n/a	2.25	n/a	3
2	2025	Sep, 26	DET	1.0	3	17	1	0	0	0	0	1	11.8												n/a	1.65	n/a	3
3	2025	Sep, 25	@TOR	0.2	3	10	1	1	1	0	0	0	20.0												n/a	-1.10	n/a	-1
4	2025	Sep, 19	@TB	1.0	3	18	0	0	0	0	0	0	11.1												n/a	2.25	n/a	3
5	2025	Sep, 17	ATH	0.2	3	8	1	0	0	0	1	1	25.0												n/a	2.90	n/a	5
6	2025	Sep, 16	ATH	1.0	4	16	1	0	0	0	3	4	56.3												n/a	7.65	n/a	12
7	2025	Sep, 12	NYY	1.0	4	21	1	0	0	2	0	1	14.3												n/a	0.45	n/a	3
8	2025	Sep, 08	@ATH	1.0	3	7	0	0	0	0	0	1	28.6												n/a	2.25	n/a	3
9	2025	Sep, 07	@ARI	0.1	4	16	2	0	1	1	1	0	43.8												n/a	-1.05	n/a	1
10	2025	Sep, 03	CLE	4.0	14	63	2	0	0	0	4	5	20.6												n/a	15.80	n/a	24
11	2025	Jun, 29	TOR	1.0	7	28	2	0	1	1	1	2	21.4												n/a	0.45	n/a	3
12	2025	Jun, 25	@LAA	1.2	7	31	2	0	0	0	4	4	25.8												n/a	10.55	n/a	17
13	2025	Jun, 22	@SF	1.1	7	23	3	1	1	0	0	1	17.4												n/a	-0.80	n/a	1
14	2025	Jun, 20	@SF	0.2	3	14	0	0	0	1	2	2	50.0												n/a	4.90	n/a	8
15	2025	Jun, 17	@SEA	1.2	5	16	0	0	0	0	2	3	37.5												n/a	7.75	n/a	11
16	2025	Jun, 09	TB	1.0	7	23	1	0	1	3	1	1	21.7	4.3%	98.1	13.0%	83.6	21.7%	97.9	39.1%	94.1	17.4%	82.8		n/a	-0.15	n/a	3
17	2025	Jun, 08	@NYY	0.1	3	9	2	0	0	0	0	1	11.1	11.1%	96.5	11.1%	82.9			44.4%	93.3	33.3%	80.9		n/a	-0.45	n/a	1
18	2025	Jun, 06	@NYY	2.0	7	35	1	0	0	0	4	6	31.4	11.4%	98.0	22.9%	84.2	14.3%	97.8	25.7%	94.2	25.7%	82.1		n/a	11.90	n/a	18
19	2025	Jun, 03	LAA	1.0	4	12	0	0	0	1	0	0	16.7	33.3%	96.5					58.3%	93.4				n/a	1.65	n/a	3
20	2025	May, 25	BAL	2.0	8	25	1	0	1	1	0	1	28.0	20.0%	97.2	12.0%	82.8	12.0%	96.9	40.0%	93.1	16.0%	81.7		n/a	1.30	n/a	3

2024

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

2023

Box Score														Pitch Usage/Velo										DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	FF		CH		SI		FC		ST		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		CH		SI		FC		ST		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%	30%	.185	.274	15.8	15.8	.270	.125	0	18%	.307	.494	33.3	22.2	.737	.571	1
Cutter	Fastball	91.8 MPH	2406	20%	30%	.246	.297	9.1	9.1	.313	.059	0	43%	.238	.316	17.4	13.0	.296	.056	0
Sweeper	Breaking	MPH		26%	16%	.248	.314	0.0	0.0	.331	.167	0	34%	.134	.200	66.7	0.0	.346	.200	1
Changeup	Offspeed	83.1 MPH	2086	32%	24%	.116	.126	40.0	0.0	.178	.100	0	5%	.667	.714	0.0	0.0	.967	.500	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%	29%	.284	.439	21.9	28.1	.521	.174	1	31%	.273	.375	26.5	14.3	.459	.049	0
Cutter	Fastball	91.1 MPH	2486	22%	26%	.268	.346	20.0	6.7	.481	.357	3	19%	.337	.432	0.0	13.6	.587	.211	1
Sweeper	Breaking	MPH		34%	10%	.076	.164	42.9	0.0	.087	.000	0	42%	.131	.165	31.5	3.7	.205	.096	1
Changeup	Offspeed	83.6 MPH	2177	33%	36%	.226	.305	28.6	2.9	.461	.294	3	9%	.162	.280	55.6	0.0	.532	.333	1

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	94.0 MPH	2178	15%	43%	.259	.416	25.0	37.5	.312	.000	0	53%	.333	.457	0.0	2.0	.556	.333	0
Cutter	Fastball	MPH		0%	10%	.000	.000	0.0	0.0	.000	.000	0
Slider	Breaking	85.7 MPH	2564	21%	10%	.333	.415	33.3	0.0	.667	.500	0	21%	.000	.359	0.0	0.0	.350	.315	0
Sweeper	Breaking	MPH		0%	1%	.000	.188	0.0	0.0	.134	.128	0	3%	.000	.000	0.0	0.0	.000	.000	0
Changeup	Offspeed	82.3 MPH	2286	35%	46%	.157	.322	8.3	25.0	.320	.222	0	13%	.000	.182	50.0	0.0	.000	.000	0

Splits	vs LHB								vs RHB
Year	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR
2025	69	.202	.252	.271	.083	15.9%	7.2%	0	82	.264	.328	.422	.176	29.3%	7.3%	3
2024	104	.244	.349	.457	.264	25.0%	11.5%	7	134	.214	.293	.375	.116	26.1%	9.0%	3
2023	24	.216	.348	.330	.167	16.7%	25.0%	0	19	.236	.381	.446	.143	10.5%	10.5%	0
2022	27	.200	.223	.238	.042	11.1%	7.4%	0	32	.198	.291	.424	.267	25.0%	6.3%	2

	Home								Road
Season	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR
2025	74	.260	.325	17.6%	10.8%	.336	.066	0	77	.217	.264	28.6%	3.9%	.370	.192	3
2024	104	.244	.349	25.0%	11.5%	.458	.264	7	98	.214	.320	27.6%	9.2%	.453	.191	5
2023	23	.207	.325	17.4%	17.4%	.309	.167	0	20	.250	.409	10.0%	20.0%	.475	.143	0
2022	26	.165	.238	15.4%	11.5%	.263	.045	0	33	.220	.277	21.2%	3.0%	.395	.250	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	4.34	3.42	5.64	0.00	3.97	2.95	-1.10	0.00	7.53	3.56	3.86
Home	2.90	3.24	1.26	0.00	4.53	1.42	4.61	0.00	0.63	3.68	3.60