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George Kirby

Seattle Mariners · SP Throws: R Bats: R Height: 6'4 Weight: 215 Born: )

Percentile Ranks
vs LHH
vs RHH K%
85.9
84.8 xWOBA
0.311 · 79%
0.315 · 61%
xSLG
82.8
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		23	23	10-8	126.0	4.21	1.19	26.1%	0.0%	5.5%	.257	.408	.313	.151	8.5%	35.3%	44%	44%	27%	23%	50%	17%	50%	49%	0.0	2.0	17.7	21.9	17.6	16.4
2024		33	33	14-11	191.0	3.53	1.07	23.0%	0.0%	3.0%	.236	.396	.288	.160	8.1%	30.5%	36%	43%	21%	27%	52%	18%	48%	39%	0.0	0.0	0.0	0.0	0.0	0.0
2023		31	31	13-10	190.2	3.35	1.04	22.7%	0.0%	2.5%	.262	.425	.305	.163	7.5%	32.0%	41%	45%	22%	26%	57%	17%	43%	39%	0.0	0.0	0.0	0.0	0.0	0.0
2022		25	25	8-5	130.0	3.39	1.21	24.5%	0.0%	4.1%	.232	.379	.284	.146	8.9%	31.4%	39%	46%	21%	26%	55%	19%	45%	29%	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		FS		KC		SI		FC		CH		Rating	DK $	DK	FD $	FD
1	2025	Oct, 15	202	4.0	22	74	8	3	8	2	4	9	29.7																n/a	-5.00	n/a	0
2	2025	Oct, 10	202	5.0	18	66	3	0	1	0	6	6	31.8															75.40	n/a	19.45	n/a	30
3	2025	Oct, 04	202	5.0	22	94	6	1	2	1	8	15	29.8															80.70	n/a	19.05	n/a	33
4	2025	Sep, 26	LAD	5.0	20	85	3	1	2	1	10	15	32.9															63.50	n/a	24.85	n/a	39
5	2025	Sep, 20	@HOU	6.0	22	100	5	0	0	0	7	11	32.0															62.90	n/a	28.50	n/a	49
6	2025	Sep, 14	LAA	6.1	22	101	3	2	2	0	14	17	36.6															84.70	n/a	40.45	n/a	65
7	2025	Sep, 09	STL	4.0	20	85	7	0	3	2	2	2	16.5															72.40	n/a	1.60	n/a	9
8	2025	Sep, 03	@TB	2.0	17	54	10	0	7	0	1	8	25.9															56.80	9,500	-13.50	10,100	-12
9	2025	Aug, 29	@CLE	7.0	28	98	6	2	2	0	6	10	28.6															75.20	n/a	20.15	n/a	37
10	2025	Aug, 23	ATH	6.0	25	98	4	0	1	3	3	13	24.5															54.20	n/a	13.30	n/a	28
11	2025	Aug, 17	@NYM	4.2	28	97	12	1	7	3	4	8	27.8															75.70	n/a	-4.50	n/a	5
12	2025	Aug, 12	@BAL	7.0	23	87	3	0	0	0	7	9	33.3	19.5%	6.7	26.4%	0.7			18.4%	2.7	35.6%	5.1					67.20	n/a	31.95	n/a	52
13	2025	Aug, 06	CWS	6.0	25	104	5	0	2	2	9	16	29.8	28.8%	-0.8	24.0%	2.3	1.0%	-45.1	19.2%	6.5	25.0%	2.7			1.9%	-5.3	64.80	n/a	27.30	n/a	49
14	2025	Jul, 31	TEX	6.0	22	94	3	0	0	2	6	10	24.5															72.60	n/a	26.50	n/a	46
15	2025	Jul, 26	@LAA	6.0	26	106	5	1	2	3	9	18	28.3	28.3%	-5.5	26.4%	8.2	7.5%	8.4	7.5%	-2.5	28.3%	2.7	1.9%	0.1			74.50	9,000	26.70	8,800	49
16	2025	Jul, 21	MIL	6.0	24	83	5	0	4	1	3	12	26.5	31.3%	4.0	18.1%	-7.3			22.9%	-2.7	27.7%	2.7					72.70	9,200	7.90	9,500	15
17	2025	Jul, 12	@DET	5.0	23	99	5	1	4	3	6	12	32.3	27.3%	-1.1	39.4%	4.4	4.0%	-64.2	10.1%	7.4	19.2%	-4.5					70.60	n/a	14.45	9,500	27
18	2025	Jul, 06	PIT	6.1	24	93	4	0	0	0	9	17	32.3	29.0%	3.7	33.3%	5.5	8.6%	2.8	6.5%	3.8	21.5%	-0.8	1.1%	-1.1			73.50	n/a	33.85	n/a	56
19	2025	Jun, 30	KC	6.0	21	85	3	0	1	0	5	12	35.3															65.60	7,700	23.70	8,200	40
20	2025	Jun, 25	@MIN	6.0	22	90	3	0	1	1	3	6	22.2															59.30	n/a	15.10	n/a	28

2024

Box Score														Pitch Usage/Velo														DFS
#	Date		Opp	IP	BF	PC	H	HR	ER	BB	SO	SwStr	CSW%	FF		SL		FS		KC		SI		CH		FC		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		SL		FS		KC		SI		FC		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		FS		KC		SI		FC		CH		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%	48%	.286	.364	16.7	10.0	.460	.139	3	46%	.140	.213	54.5	9.1	.249	.140	2
Slider	Breaking	87.2 MPH	2369	31%	40%	.195	.229	29.8	1.8	.304	.132	1	50%	.309	.346	22.8	0.0	.502	.073	0
Changeup	Offspeed	87.8 MPH	1423	10%	5%	.121	.113	14.3	0.0	.139	.000	0	1%	.326	.301	50.0	0.0	.362	.000	0
Split-finger	Offspeed	86.0 MPH	918	37%	6%	.442	.478	20.0	0.0	.671	.300	1	3%	.000	.362	50.0	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%	50%	.223	.288	26.2	4.1	.424	.235	7	50%	.214	.299	36.1	4.1	.456	.239	7
Cutter	Fastball	MPH		0%	0%	.043	.044	0.0	0.0	.060	.000	0	1%	.000	.000	0.0	0.0	.000	.000	0
Slider	Breaking	87.2 MPH	2364	27%	30%	.260	.325	20.3	7.2	.426	.141	2	40%	.219	.259	24.7	0.0	.359	.055	1
Split-finger	Offspeed	86.0 MPH	946	30%	20%	.269	.314	20.4	0.0	.459	.196	2	9%	.147	.203	33.3	0.0	.178	.083	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
4-Seamer	Fastball	96.0 MPH	2216	28%	43%	.254	.300	20.6	3.6	.419	.140	3	37%	.254	.322	37.0	4.1	.463	.187	7
Sinker	Fastball	95.8 MPH	2227	13%	11%	.267	.346	32.0	6.0	.501	.170	2	30%	.283	.302	13.4	0.7	.374	.096	2
Curveball	Breaking	81.8 MPH	2343	16%	14%	.298	.333	27.1	0.0	.511	.364	2	9%	.222	.256	5.6	0.0	.389	.212	1
Slider	Breaking	86.3 MPH	2335	22%	18%	.321	.327	7.7	2.6	.390	.167	1	21%	.246	.265	15.5	1.4	.356	.086	1
Changeup	Offspeed	86.6 MPH	1518	13%	4%	.000	.874	0.0	0.0	.470	.565	1	0%	.000	.000	0.0	0.0	.000	.000	0
Splitter	Offspeed	MPH		0%	10%	.098	.113	39.0	0.0	.171	.125	1	2%	.375	.516	50.0	0.0	.875	.667	1

Splits	vs LHB								vs RHB
Year	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR	PA	xBAVG	xWOBA	xSLG	ISO	K%	BB%	HR
2025	284	.252	.311	.395	.147	25.7%	7.0%	9	240	.263	.315	.423	.131	26.7%	3.8%	6
2024	355	.238	.294	.409	.177	24.5%	4.2%	12	422	.234	.282	.387	.126	21.6%	1.9%	10
2023	353	.258	.303	.428	.157	23.2%	2.8%	10	403	.265	.307	.422	.141	22.3%	2.0%	12
2022	284	.215	.263	.342	.094	27.1%	4.9%	4	258	.252	.307	.419	.168	21.7%	3.1%	9

	Home								Road
Season	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR	PA	xAVG	xWOBA	K%	BB%	xSLG	ISO	HR
2025	53	.227	.275	73.0%	17.0%	.351	.289	0	47	.279	.327	64.0%	12.0%	.437	.344	1
2024	355	.238	.294	24.5%	4.2%	.409	.177	12	445	.250	.313	21.3%	2.9%	.456	.189	17
2023	358	.240	.276	26.8%	2.5%	.369	.128	9	398	.281	.331	19.1%	2.3%	.475	.167	13
2022	297	.231	.275	25.9%	3.4%	.366	.134	9	245	.234	.295	22.9%	4.9%	.395	.123	4

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	15.70	15.33	16.75	0.00	14.02	22.21	15.84	0.00	16.55	16.01	16.75
Home	18.62	17.42	22.71	0.00	21.19	18.19	17.04	0.00	17.34	19.00	19.20