Seth Lonsway

San Francisco Giants

Age: 27

Bats/Throws: L/L

6'0" / 206

DOB: 10/7/1998

(27 years, 11 months, 22 days)

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Preseason ProjectionsIn-Season ProjectionsMinor LeaguesSpring TrainingMLB Regular SeasonCollege

Season	Team	Level	Age	W	L	SV	G	GS	IP	K/9	BB/9	HR/9	BABIP	LOB%	GB%	HR/FB	vFA	ERA	xERA	FIP	xFIP	WAR
2021	OSU	NCAA	22	3	5	0	12	12	68.0	12.97	5.69	0.79	.246	69.3%				4.37		4.50
2021	SFG	CPX	22	0	0	0	4	4	5.0	18.00	0.00	1.80	.444	27.8%	80.0%	50.0%		7.20		3.08	0.98
2022	SFG	A	23	9	3	1	26	9	95.1	11.33	4.81	0.76	.320	65.5%	67.5%	19.0%		4.06		4.70	4.22
2023	SFG	A+	24	2	9	2	28	17	89.0	7.89	5.87	0.91	.330	63.5%	58.1%	13.4%		5.87		5.59	5.37
2024	SFG	A+	25	2	3	0	13	12	63.0	8.14	2.86	0.29	.323	60.3%	63.9%	5.6%		3.86		3.37	3.64
2024	SFG	AA	25	2	1	0	6	5	32.2	7.16	1.93	0.55	.290	86.0%	50.5%	9.5%		1.38		3.59	3.59
2024	SFG	MiLB	25	4	4	0	19	17	95.2	7.81	2.54	0.38	.312	68.1%	59.4%	7.0%		3.01		3.44	3.62
2025	SFG	AA	26	3	8	0	19	19	92.0	8.22	4.11	0.68	.327	78.5%	51.0%	11.7%		3.52		4.15	3.92
2025	SFG	AAA	26	2	4	0	9	9	42.0	8.14	5.36	0.43	.350	70.4%	53.0%	6.3%		4.29	4.67	4.78	5.56
2025	SFG	MiLB	26	5	12	0	28	28	134.0	8.19	4.50	0.60	.334	75.7%	51.6%	9.8%		3.76	4.67	4.35	4.43
2025	SFG	ST	26	0	0	0	2	0	1.0	18.00	18.00	0.00	.333	66.7%	0.0%	0.0%		9.00		5.73	7.50
2026	Steamer	PROJ	27	0	0	0	0	0	1.0	5.91	3.85	0.93	.306	70.8%	53.0%			4.48		4.64	4.66	0.0
2026	ZiPS	PROJ	27	5	8	0	24	21	102.7	6.05	4.38	1.05	.298	69.3%				4.91		5.09		0.0
2026	OOPSY	PROJ	27	0	0	0	1	1	4.5	5.38	4.19	1.03	.303	66.0%				5.20		4.98		0.0
2026	SFG	AA	27	0	0	0	1	0	3.2	4.91	2.45	0.00	.273	50.0%	72.7%	0.0%		4.91		3.33	4.35
2026	SFG	AAA	27	2	5	1	24	20	91.2	5.79	5.69	1.08	.290	70.6%	57.6%	17.7%		5.11	6.65	6.24	5.84
2026	SFG	MiLB	27	2	5	1	25	20	95.1	5.76	5.57	1.04	.290	70.1%	58.2%	17.2%		5.10	6.65	6.12	5.78
2026	SFG	MLB	27	0	0	0	2	0	2.1	7.71	0.00	0.00	.583	57.1%	90.9%	0.0%	91.5	7.71	1.77	1.39	2.03	0.1
2026	FGDC	ROS	27	6	10	0	61	16	132.0	5.61	4.45	0.93	.307	70.2%				4.73		4.93		0.1
Total	- - -	MLB		0	0	0	2	0	2.1	7.71	0.00	0.00	.583	57.1%	90.9%	0.0%	91.5	7.71	1.77	1.39	2.03	0.1

Season	Team	Level	Age	W	L	SV	G	GS	IP	K/9	BB/9	HR/9	BABIP	LOB%	GB%	HR/FB	vFA	ERA	xERA	FIP	xFIP	WAR
2021	OSU	NCAA	22	3	5	0	12	12	68.0	12.97	5.69	0.79	.246	69.3%				4.37		4.50
2021	SFG	CPX	22	0	0	0	4	4	5.0	18.00	0.00	1.80	.444	27.8%	80.0%	50.0%		7.20		3.08	0.98
2022	SFG	A	23	9	3	1	26	9	95.1	11.33	4.81	0.76	.320	65.5%	67.5%	19.0%		4.06		4.70	4.22
2023	SFG	A+	24	2	9	2	28	17	89.0	7.89	5.87	0.91	.330	63.5%	58.1%	13.4%		5.87		5.59	5.37
2024	SFG	A+	25	2	3	0	13	12	63.0	8.14	2.86	0.29	.323	60.3%	63.9%	5.6%		3.86		3.37	3.64
2024	SFG	AA	25	2	1	0	6	5	32.2	7.16	1.93	0.55	.290	86.0%	50.5%	9.5%		1.38		3.59	3.59
2024	SFG	MiLB	25	4	4	0	19	17	95.2	7.81	2.54	0.38	.312	68.1%	59.4%	7.0%		3.01		3.44	3.62
2025	SFG	AA	26	3	8	0	19	19	92.0	8.22	4.11	0.68	.327	78.5%	51.0%	11.7%		3.52		4.15	3.92
2025	SFG	AAA	26	2	4	0	9	9	42.0	8.14	5.36	0.43	.350	70.4%	53.0%	6.3%		4.29	4.67	4.78	5.56
2025	SFG	MiLB	26	5	12	0	28	28	134.0	8.19	4.50	0.60	.334	75.7%	51.6%	9.8%		3.76	4.67	4.35	4.43
2025	SFG	ST	26	0	0	0	2	0	1.0	18.00	18.00	0.00	.333	66.7%	0.0%	0.0%		9.00		5.73	7.50
2026	Steamer	PROJ	27	0	0	0	0	0	1.0	5.91	3.85	0.93	.306	70.8%	53.0%			4.48		4.64	4.66	0.0
2026	ZiPS	PROJ	27	5	8	0	24	21	102.7	6.05	4.38	1.05	.298	69.3%				4.91		5.09		0.0
2026	OOPSY	PROJ	27	0	0	0	1	1	4.5	5.38	4.19	1.03	.303	66.0%				5.20		4.98		0.0
2026	SFG	AA	27	0	0	0	1	0	3.2	4.91	2.45	0.00	.273	50.0%	72.7%	0.0%		4.91		3.33	4.35
2026	SFG	AAA	27	2	5	1	24	20	91.2	5.79	5.69	1.08	.290	70.6%	57.6%	17.7%		5.11	6.65	6.24	5.84
2026	SFG	MiLB	27	2	5	1	25	20	95.1	5.76	5.57	1.04	.290	70.1%	58.2%	17.2%		5.10	6.65	6.12	5.78
2026	SFG	MLB	27	0	0	0	2	0	2.1	7.71	0.00	0.00	.583	57.1%	90.9%	0.0%	91.5	7.71	1.77	1.39	2.03	0.1
2026	FGDC	ROS	27	6	10	0	61	16	132.0	5.61	4.45	0.93	.307	70.2%				4.73		4.93		0.1
Total	- - -	MLB		0	0	0	2	0	2.1	7.71	0.00	0.00	.583	57.1%	90.9%	0.0%	91.5	7.71	1.77	1.39	2.03	0.1

Preseason ProjectionsIn-Season ProjectionsMinor LeaguesSpring TrainingMLB Regular SeasonCollege

Season	Team	Level	W	L	ERA	G	GS	QS	CG	ShO	SV	HLD	BS	IP	TBF	H	R	ER	HR	BB	IBB	HBP	WP	BK	SO
2021	OSU	NCAA	3	5	4.37	12	12		1	1	0			68.0	297	40	35	33	6	43		12	12	0	98
2021	SFG	CPX	0	0	7.20	4	4		0	0	0	0	0	5.0	20	5	4	4	1	0	0	0	0	0	10
2022	SFG	A	9	3	4.06	26	9		0	0	1	0	0	95.1	419	81	57	43	8	51	0	12	9	1	120
2023	SFG	A+	2	9	5.87	28	17		0	0	2	1	0	89.0	435	101	70	58	9	58	0	11	28	1	78
2024	SFG	A+	2	3	3.86	13	12		0	0	0	0	0	63.0	274	63	37	27	2	20	0	6	5	0	57
2024	SFG	AA	2	1	1.38	6	5		0	0	0	0	0	32.2	132	29	8	5	2	7	0	4	0	0	26
2024	SFG	MiLB	4	4	3.01	19	17		0	0	0	0	0	95.2	406	92	45	32	4	27	0	10	5	0	83
2025	SFG	AA	3	8	3.52	19	19		0	0	0	0	0	92.0	394	89	38	36	7	42	0	10	6	0	84
2025	SFG	AAA	2	4	4.29	9	9		0	0	0	0	0	42.0	185	43	23	20	2	25	0	3	2	0	38
2025	SFG	MiLB	5	12	3.76	28	28		0	0	0	0	0	134.0	579	132	61	56	9	67	0	13	8	0	122
2025	SFG	ST	0	0	9.00	2	0		0	0	0	1	0	1.0	7	1	1	1	0	2	0	0	0	0	2
2026	Steamer	PROJ	0	0	4.48	0	0	0	0	0	0	0		1.0	4	1	1	0	0	0	0	0			1
2026	ZiPS	PROJ	5	8	4.91	24	21				0	0		102.7	474	111	61	56	12	50	0	11	10	0	69
2026	OOPSY	PROJ	0	0	5.20	1	1	0			0	0		4.5	20	5	3	3	1	2	0	0			3
2026	SFG	AA	0	0	4.91	1	0		0	0	0	0	1	3.2	14	3	2	2	0	1	0	0	0	0	2
2026	SFG	AAA	2	5	5.11	24	20		0	0	1	0	0	91.2	419	94	57	52	11	58	0	5	3	0	59
2026	SFG	MiLB	2	5	5.10	25	20		0	0	1	0	1	95.1	433	97	59	54	11	59	0	5	3	0	61
2026	SFG	MLB	0	0	7.71	2	0	0	0	0	0	0	0	2.1	14	7	3	2	0	0	0	0	0	0	2
2026	FGDC	ROS	6	10	4.73	61	16	6			0	1		132.0	598	144	76	70	14	65		11			82
Total	- - -	MLB	0	0	7.71	2	0	0	0	0	0	0	0	2.1	14	7	3	2	0	0	0	0	0	0	2

Season	Team	Level	W	L	ERA	G	GS	QS	CG	ShO	SV	HLD	BS	IP	TBF	H	R	ER	HR	BB	IBB	HBP	WP	BK	SO
2021	OSU	NCAA	3	5	4.37	12	12		1	1	0			68.0	297	40	35	33	6	43		12	12	0	98
2021	SFG	CPX	0	0	7.20	4	4		0	0	0	0	0	5.0	20	5	4	4	1	0	0	0	0	0	10
2022	SFG	A	9	3	4.06	26	9		0	0	1	0	0	95.1	419	81	57	43	8	51	0	12	9	1	120
2023	SFG	A+	2	9	5.87	28	17		0	0	2	1	0	89.0	435	101	70	58	9	58	0	11	28	1	78
2024	SFG	A+	2	3	3.86	13	12		0	0	0	0	0	63.0	274	63	37	27	2	20	0	6	5	0	57
2024	SFG	AA	2	1	1.38	6	5		0	0	0	0	0	32.2	132	29	8	5	2	7	0	4	0	0	26
2024	SFG	MiLB	4	4	3.01	19	17		0	0	0	0	0	95.2	406	92	45	32	4	27	0	10	5	0	83
2025	SFG	AA	3	8	3.52	19	19		0	0	0	0	0	92.0	394	89	38	36	7	42	0	10	6	0	84
2025	SFG	AAA	2	4	4.29	9	9		0	0	0	0	0	42.0	185	43	23	20	2	25	0	3	2	0	38
2025	SFG	MiLB	5	12	3.76	28	28		0	0	0	0	0	134.0	579	132	61	56	9	67	0	13	8	0	122
2025	SFG	ST	0	0	9.00	2	0		0	0	0	1	0	1.0	7	1	1	1	0	2	0	0	0	0	2
2026	Steamer	PROJ	0	0	4.48	0	0	0	0	0	0	0		1.0	4	1	1	0	0	0	0	0			1
2026	ZiPS	PROJ	5	8	4.91	24	21				0	0		102.7	474	111	61	56	12	50	0	11	10	0	69
2026	OOPSY	PROJ	0	0	5.20	1	1	0			0	0		4.5	20	5	3	3	1	2	0	0			3
2026	SFG	AA	0	0	4.91	1	0		0	0	0	0	1	3.2	14	3	2	2	0	1	0	0	0	0	2
2026	SFG	AAA	2	5	5.11	24	20		0	0	1	0	0	91.2	419	94	57	52	11	58	0	5	3	0	59
2026	SFG	MiLB	2	5	5.10	25	20		0	0	1	0	1	95.1	433	97	59	54	11	59	0	5	3	0	61
2026	SFG	MLB	0	0	7.71	2	0	0	0	0	0	0	0	2.1	14	7	3	2	0	0	0	0	0	0	2
2026	FGDC	ROS	6	10	4.73	61	16	6			0	1		132.0	598	144	76	70	14	65		11			82
Total	- - -	MLB	0	0	7.71	2	0	0	0	0	0	0	0	2.1	14	7	3	2	0	0	0	0	0	0	2

Preseason ProjectionsIn-Season ProjectionsMinor LeaguesSpring TrainingMLB Regular SeasonAveragesCollege

Season	Team	Level	K/9	BB/9	K/BB	HR/9	K%	BB%	K-BB%	AVG	WHIP	BABIP	LOB%	ERA-	FIP-	FIP
2021	OSU	NCAA	12.97	5.69	2.28	0.79	33.0%	14.5%	18.5%	.165	1.22	.246	69.3%			4.50
2021	SFG	CPX	18.00	0.00	10.00	1.80	50.0%	0.0%	50.0%	.250	1.00	.444	27.8%	141	59	3.08
2022	SFG	A	11.33	4.81	2.35	0.76	28.6%	12.2%	16.5%	.228	1.38	.320	65.5%	77	89	4.70
2023	SFG	A+	7.89	5.87	1.34	0.91	17.9%	13.3%	4.6%	.276	1.79	.330	63.5%	136	128	5.59
2024	SFG	A+	8.14	2.86	2.85	0.29	20.8%	7.3%	13.5%	.254	1.32	.323	60.3%	97	84	3.37
2024	SFG	AA	7.16	1.93	3.71	0.55	19.7%	5.3%	14.4%	.240	1.10	.290	86.0%	35	91	3.59
2024	SFG	MiLB	7.81	2.54	3.07	0.38	20.4%	6.7%	13.8%	.249	1.24	.312	68.1%	76	86	3.44
2025	SFG	AA	8.22	4.11	2.00	0.68	21.3%	10.7%	10.7%	.260	1.42	.327	78.5%	93	108	4.15
2025	SFG	AAA	8.14	5.36	1.52	0.43	20.5%	13.5%	7.0%	.274	1.62	.350	70.4%	87	91	4.78
2025	SFG	MiLB	8.19	4.50	1.82	0.60	21.1%	11.6%	9.5%	.265	1.49	.334	75.7%	91	103	4.35
2025	SFG	ST	18.00	18.00	1.00	0.00	28.6%	28.6%	0.0%	.200	3.00	.333	66.7%	180	119	5.73
2026	Steamer	PROJ	5.91	3.85	1.53	0.93	14.7%	9.6%	5.1%	.274	1.51	.306	70.8%			4.64
2026	ZiPS	PROJ	6.05	4.38	1.38	1.05	14.6%	10.5%	4.0%	.269	1.57	.298	69.3%			5.09
2026	OOPSY	PROJ	5.38	4.19	1.28	1.03	13.6%	10.6%	3.0%	.277	1.54	.303	66.0%			4.98
2026	SFG	AA	4.91	2.45	2.00	0.00	14.3%	7.1%	7.1%	.231	1.09	.273	50.0%	105	71	3.33
2026	SFG	AAA	5.79	5.69	1.02	1.08	14.1%	13.8%	0.2%	.264	1.66	.290	70.6%	106	122	6.24
2026	SFG	MiLB	5.76	5.57	1.03	1.04	14.1%	13.6%	0.5%	.263	1.64	.290	70.1%	106	120	6.12
2026	SFG	MLB	7.71	0.00	2.00	0.00	14.3%	0.0%	14.3%	.500	3.00	.583	57.1%	189	34	1.39
2026			8.50	3.41	2.49	1.16	22.1%	8.9%	13.3%	.241	1.30	.288	72.3%			4.28
2026	FGDC	ROS	5.61	4.45	1.26	0.93	13.8%	11.0%	2.8%	.277	1.59	.307	70.2%			4.93
Total	- - -	MLB	7.71	0.00	2.00	0.00	14.3%	0.0%	14.3%	.500	3.00	.583	57.1%	189	34	1.39

Season	Team	Level	K/9	BB/9	K/BB	HR/9	K%	BB%	K-BB%	AVG	WHIP	BABIP	LOB%	ERA-	FIP-	FIP
2021	OSU	NCAA	12.97	5.69	2.28	0.79	33.0%	14.5%	18.5%	.165	1.22	.246	69.3%			4.50
2021	SFG	CPX	18.00	0.00	10.00	1.80	50.0%	0.0%	50.0%	.250	1.00	.444	27.8%	141	59	3.08
2022	SFG	A	11.33	4.81	2.35	0.76	28.6%	12.2%	16.5%	.228	1.38	.320	65.5%	77	89	4.70
2023	SFG	A+	7.89	5.87	1.34	0.91	17.9%	13.3%	4.6%	.276	1.79	.330	63.5%	136	128	5.59
2024	SFG	A+	8.14	2.86	2.85	0.29	20.8%	7.3%	13.5%	.254	1.32	.323	60.3%	97	84	3.37
2024	SFG	AA	7.16	1.93	3.71	0.55	19.7%	5.3%	14.4%	.240	1.10	.290	86.0%	35	91	3.59
2024	SFG	MiLB	7.81	2.54	3.07	0.38	20.4%	6.7%	13.8%	.249	1.24	.312	68.1%	76	86	3.44
2025	SFG	AA	8.22	4.11	2.00	0.68	21.3%	10.7%	10.7%	.260	1.42	.327	78.5%	93	108	4.15
2025	SFG	AAA	8.14	5.36	1.52	0.43	20.5%	13.5%	7.0%	.274	1.62	.350	70.4%	87	91	4.78
2025	SFG	MiLB	8.19	4.50	1.82	0.60	21.1%	11.6%	9.5%	.265	1.49	.334	75.7%	91	103	4.35
2025	SFG	ST	18.00	18.00	1.00	0.00	28.6%	28.6%	0.0%	.200	3.00	.333	66.7%	180	119	5.73
2026	Steamer	PROJ	5.91	3.85	1.53	0.93	14.7%	9.6%	5.1%	.274	1.51	.306	70.8%			4.64
2026	ZiPS	PROJ	6.05	4.38	1.38	1.05	14.6%	10.5%	4.0%	.269	1.57	.298	69.3%			5.09
2026	OOPSY	PROJ	5.38	4.19	1.28	1.03	13.6%	10.6%	3.0%	.277	1.54	.303	66.0%			4.98
2026	SFG	AA	4.91	2.45	2.00	0.00	14.3%	7.1%	7.1%	.231	1.09	.273	50.0%	105	71	3.33
2026	SFG	AAA	5.79	5.69	1.02	1.08	14.1%	13.8%	0.2%	.264	1.66	.290	70.6%	106	122	6.24
2026	SFG	MiLB	5.76	5.57	1.03	1.04	14.1%	13.6%	0.5%	.263	1.64	.290	70.1%	106	120	6.12
2026	SFG	MLB	7.71	0.00	2.00	0.00	14.3%	0.0%	14.3%	.500	3.00	.583	57.1%	189	34	1.39
2026			8.50	3.41	2.49	1.16	22.1%	8.9%	13.3%	.241	1.30	.288	72.3%			4.28
2026	FGDC	ROS	5.61	4.45	1.26	0.93	13.8%	11.0%	2.8%	.277	1.59	.307	70.2%			4.93
Total	- - -	MLB	7.71	0.00	2.00	0.00	14.3%	0.0%	14.3%	.500	3.00	.583	57.1%	189	34	1.39

Preseason ProjectionsIn-Season ProjectionsMinor LeaguesSpring TrainingMLB Regular SeasonCollege

Season	Team	Level	Events	EV	maxEV	LA	Barrels	Barrel%	HardHit	HardHit%	ERA	xERA
2025	SFG	AAA	119	85.7	107.8	5.1	4	3.4%	34	28.6%	4.29	4.67
2026	SFG	AAA	297	86.8	112.6	2.5	17	5.7%	105	35.4%	5.11	6.65
2026	SFG	MLB	12	90.0	105.5	1.5	0	0.0%	4	33.3%	7.71	1.77
Total	- - -	MLB	12	90.0	105.5	1.5	0	0.0%	4	33.3%	7.71	1.77

Season	Team	Level	Events	EV	maxEV	LA	Barrels	Barrel%	HardHit	HardHit%	ERA	xERA
2025	SFG	AAA	119	85.7	107.8	5.1	4	3.4%	34	28.6%	4.29	4.67
2026	SFG	AAA	297	86.8	112.6	2.5	17	5.7%	105	35.4%	5.11	6.65
2026	SFG	MLB	12	90.0	105.5	1.5	0	0.0%	4	33.3%	7.71	1.77
Total	- - -	MLB	12	90.0	105.5	1.5	0	0.0%	4	33.3%	7.71	1.77

Seth Lonsway

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BAL	CHW	ATH
BOS	CLE	HOU
NYY	DET	LAA
TBR	KCR	SEA
TOR	MIN	TEX

ATL	CHC	ARI
MIA	CIN	COL
NYM	MIL	LAD
PHI	PIT	SDP
WSN	STL	SFG