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Stephen Kolek

Kansas City Royals · SP Throws: R Bats: R Height: 6'4 Weight: 210 Born: )

Percentile Ranks
vs LHH
vs RHH K%
38.4
4.8 xWOBA
0.352 · 36%
0.297 · 79%
xSLG
38.4
86.2

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		19	19	5-7	112.2	3.51	1.15	16.7%	0.0%	6.7%	.268	.414	.327	.146	6.1%	32.9%	48%	52%	23%	22%	52%	10%	48%	38%	0.0	15.4	11.9	7.6	15.1	19.0
2024		42	0	3-0	46.2	5.21	1.54	18.5%	0.0%	5.7%	.279	.405	.325	.126	3.8%	30.8%	41%	56%	26%	17%	54%	15%	46%	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%	SI		FC		ST		FF		SL		CH		Rating	DK $	DK	FD $	FD
1	2025	Sep, 24	@LAA	6.0	26	94	5	1	2	2	2	9	18.1													61.00	n/a	9.30	n/a	22
2	2025	Sep, 18	SEA	7.1	25	99	2	0	1	1	8	8	29.3													54.10	7,200	28.70	7,800	47
3	2025	Sep, 11	@CLE	6.2	24	97	3	0	1	1	4	4	25.8													65.80	n/a	18.60	n/a	33
4	2025	Sep, 06	MIN	7.0	28	95	6	0	2	1	4	8	24.2													65.40	n/a	19.55	n/a	37
5	2025	Aug, 30	DET	6.0	22	71	4	0	1	0	3	4	21.1													59.80	n/a	15.10	n/a	28
6	2025	Jul, 27	SD	6.0	24	98	4	1	2	3	2	6	21.4													48.10	n/a	13.30	n/a	28
7	2025	Jul, 22	@MIA	5.2	25	80	8	0	3	1	5	8	28.8	38.8%	-3.1	8.8%	-1.2	10.0%	1.5	10.0%	1.0	26.3%	6.1	6.3%	-14.5	51.90	n/a	11.35	n/a	23
8	2025	Jul, 05	TEX	5.1	26	83	9	2	6	1	2	5	18.1	20.5%	-10.4	13.3%	11.0	3.6%	-1.3	14.5%	0.7	26.5%	-5.9	21.7%	-10.0	52.20	n/a	-2.00	n/a	4
9	2025	Jun, 29	@CIN	5.2	20	71	3	0	1	1	5	5	32.4													54.10	7,200	18.35	7,500	29
10	2025	Jun, 23	WSH	4.1	19	80	5	0	4	1	5	7	28.8													58.40	n/a	8.15	n/a	16
11	2025	Jun, 18	@LAD	6.1	25	97	6	0	3	1	3	7	24.7													54.60	n/a	10.05	n/a	23
12	2025	Jun, 13	@ARI	4.1	24	82	7	2	4	2	5	10	29.3	18.3%	94.0	23.2%	91.3	3.7%	83.9	11.0%	86.9	20.7%	94.4	23.2%	86.6	53.60	n/a	6.35	n/a	16
13	2025	Jun, 07	@MIL	5.2	22	88	3	0	0	4	2	7	23.9	25.0%	94.1	17.0%	91.5	3.4%	83.3	3.4%	89.1	28.4%	93.9	22.7%	85.2	65.40	n/a	12.55	n/a	23
14	2025	Jun, 02	@SF	5.2	22	98	3	0	0	2	3	5	27.6	24.5%	93.7	23.5%	92.0	2.0%	82.4	6.1%	88.0	22.4%	94.5	21.4%	85.4	67.90	8,200	15.75	8,800	26
15	2025	May, 27	MIA	5.1	25	93	6	0	6	2	3	8	18.3	24.7%	93.2	23.7%	90.9	2.2%	82.8	6.5%	87.4	25.8%	93.3	17.2%	84.3	89.60	n/a	5.20	n/a	13
16	2025	May, 22	@TOR	6.0	29	92	7	0	3	3	6	8	26.1	35.9%	93.6	10.9%	91.1	5.4%	82.7	16.3%	87.7	23.9%	94.4	7.6%	84.7	70.00	n/a	13.50	n/a	31
17	2025	May, 16	SEA	5.0	23	83	8	3	5	1	4	5	24.1	16.9%	93.2	8.4%	90.3	26.5%	82.5	9.6%	88.0	24.1%	94.0	14.5%	85.1	54.70	7,700	3.85	8,100	12
18	2025	May, 10	@COL	9.0	32	104	5	0	0	2	7	8	27.9	16.3%	94.3	10.6%	91.8	3.8%	83.3	51.0%	95.2	7.7%	84.7	10.6%	87.7	52.20	n/a	34.05	n/a	58
19	2025	May, 04	@PIT	5.1	20	84	4	0	0	2	4	5	23.8	38.1%	94.2	9.5%	91.8	2.4%	83.2	16.7%	94.2	20.2%	85.9	13.1%	86.5	80.20	n/a	20.40	n/a	34

2024

Box Score														Pitch Usage/Velo												DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	SI		FC		ST		CH		FF		SL		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%	38%	.264	.364	23.4	7.8	.506	.232	4	29%	.234	.376	23.1	11.5	.493	.100	0
Cutter	Fastball	90.5 MPH	2354	19%	19%	.228	.341	19.0	16.7	.410	.114	1	21%	.320	.318	5.3	0.0	.465	.000	0
Slider	Breaking	85.4 MPH	2520	21%	18%	.358	.372	17.1	2.9	.450	.091	0	31%	.252	.250	18.9	0.0	.322	.108	1
Sweeper	Breaking	MPH		18%	5%	.433	.611	22.2	0.0	1.042	.556	1	17%	.267	.266	13.3	0.0	.342	.000	0
Changeup	Offspeed	87.5 MPH	1468	25%	19%	.198	.223	15.4	0.0	.274	.000	0	2%	.000	.000	100.0	0.0	.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
4-Seamer	Fastball	MPH		0%	24%	.317	.298	21.4	0.0	.361	.071	0	20%	.043	.039	85.7	0.0	.044	.000	0
Cutter	Fastball	92.4 MPH	2346	20%	40%	.281	.288	3.8	0.0	.343	.040	0	26%	.206	.258	20.0	0.0	.397	.267	1
Slider	Breaking	88.2 MPH	2458	25%	9%	.408	.379	0.0	0.0	.459	.000	0	24%	.352	.408	26.3	0.0	.604	.158	1
Sweeper	Breaking	MPH		26%	4%	.000	.000	100.0	0.0	.000	.000	0	30%	.434	.557	18.2	9.1	.857	.450	2
Changeup	Offspeed	88.8 MPH	1801	15%	23%	.179	.198	31.3	6.3	.190	.000	0	0%	.000	.000	0.0	0.0	.000	.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	250	.274	.352	.456	.152	19.2%	8.8%	7	210	.261	.297	.365	.052	13.8%	3.8%	2
2024	92	.261	.290	.327	.024	16.3%	5.4%	0	119	.293	.352	.466	.173	20.2%	5.9%	4

	Home								Road
Season	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR
2025	36	.255	.291	29.0%	7.0%	.389	.278	1	64	.223	.274	48.0%	23.0%	.312	.256	1
2024	118	.284	.335	22.0%	5.1%	.443	.118	3	93	.273	.311	14.0%	6.5%	.357	.094	1

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	4.64	7.08	3.77	2.17	8.48	0.88	8.70	0.00	5.35	8.28	3.55
Home	5.81	8.26	3.58	-1.55	10.07	1.77	9.13	0.00	1.93	8.33	3.87