Mason Barnett

Position: Starting Pitcher

Bats: Right • Throws: Right

6-0, 218lb (183cm, 98kg)

Team: Athletics (majors)

Born: November 7, 2000 in Kennesaw, GA us

Draft: Drafted by the Kansas City Royals in the 3rd round of the 2022 MLB June Amateur Draft from Auburn University (Auburn, AL).

High School: Cartersville HS (Cartersville, GA)

School: Auburn University (Auburn, AL)

Rookie Status: Still Intact through 2026

2026 Contract Status: Pre-Arb Eligible

Service Time (01/2026): 0.034 • Arb Eligible: 2029 • Free Agent: 2032

Full Name: Mason McLendon Barnett

Instagram: @mason.barnett18

View Player Info from the B-R Bullpen

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SUMMARY

2026

Career

WAR

0.4

0.2

ERA

3.54

5.27

20.1

42.2

WHIP

1.230

1.453

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Year	Age	AgeDif	Tm	Lg	Lev	Aff	W	L	W-L%	ERA	RA9	G	GS	GF	CG	SHO	SV	IP	H	R	ER	HR	BB	IBB	SO	HBP	BK	WP	BF	WHIP	H9	HR9	BB9	SO9	SO/W
2020	19	-1.5	Auburn	SEC	NCAA		0	0		3.52	4.70	6	0		0	0	0	7.2	5	4	3	0	3	0	16	1	0	1	31	1.043	5.9	0.0	3.5	18.8	5.33
2021	20	-0.8	Auburn	SEC	NCAA		2	4	.333	5.40	6.30	16	6		0	0	1	40.0	39	28	24	3	21	1	43	8	1	4	183	1.500	8.8	0.7	4.7	9.7	2.05
2021	20	-0.4	Brewster	CCBL	Smr		1	1	.500	4.95	4.95	5	5	0	0	0	0	20.0	19	11	11	3	6	0	23	3	0	1	87	1.250	8.6	1.4	2.7	10.4	3.83
2022	21	0.3	Auburn	SEC	NCAA		3	3	.500	4.38	4.52	19	14		0	0	0	63.2	63	32	31	5	32	0	83	3	0	4	283	1.492	8.9	0.7	4.5	11.7	2.59
2022	21		2 Teams	2 Lgs	A-Rk	KCR	1	0	1.000	0.00	0.00	4	1	0	0	0	0	8.0	0	0	0	0	1	0	12	1	0	0	24	0.125	0.0	0.0	1.1	13.5	12.00
2022	21	-0.7	Columbia	CARL	A	KCR	1	0	1.000	0.00	0.00	3	0	0	0	0	0	7.0	0	0	0	0	1	0	11	1	0	0	21	0.143	0.0	0.0	1.3	14.1	11.00
2022	21	-0.2	Royals	ACL	Rk	KCR	0	0		0.00	0.00	1	1	0	0	0	0	1.0	0	0	0	0	0	0	1	0	0	0	3	0.000	0.0	0.0	0.0	9.0
2023	22		2 Teams	2 Lgs	A+-AA	KCR	6	7	.462	3.30	3.61	23	23	0	0	0	0	114.2	86	46	42	5	50	0	137	7	2	8	476	1.186	6.8	0.4	3.9	10.8	2.74
2023	22	-2.6	Northwest Arkansas	TL	AA	KCR	2	1	.667	3.58	3.58	7	7	0	0	0	0	32.2	27	13	13	2	12	0	43	1	1	1	137	1.194	7.4	0.6	3.3	11.8	3.58
2023	22	-1.1	Quad Cities	MIDW	A+	KCR	4	6	.400	3.18	3.62	16	16	0	0	0	0	82.0	59	33	29	3	38	0	94	6	1	7	339	1.183	6.5	0.3	4.2	10.3	2.47
2024	23		2 Teams	TL	AA	KCR-OAK	9	8	.529	4.20	4.67	26	25	0	0	0	0	133.0	121	69	62	13	49	0	161	8	0	3	565	1.278	8.2	0.9	3.3	10.9	3.29
2024	23	-1.3	Northwest Arkansas	TL	AA	KCR	5	6	.455	4.91	5.40	19	18	0	0	0	0	91.2	89	55	50	9	36	0	109	6	0	3	398	1.364	8.7	0.9	3.5	10.7	3.03
2024	23	-1.3	Midland	TL	AA	OAK	4	2	.667	2.61	3.05	7	7	0	0	0	0	41.1	32	14	12	4	13	0	52	2	0	0	167	1.089	7.0	0.9	2.8	11.3	4.00
2025	24	-3.1	Las Vegas	PCL	AAA	ATH	6	2	.750	6.13	6.13	25	23	1	0	0	0	119.0	125	81	81	17	65	0	124	6	3	7	544	1.597	9.5	1.3	4.9	9.4	1.91
2025	24	-5.2	ATH	AL	Maj	ATH	1	1	.500	6.85	7.25	5	5	0	0	0	0	22.1	26	18	17	3	11	0	18	1	0	2	104	1.657	10.5	1.2	4.4	7.3	1.64
2026	25	-2.7	Las Vegas	PCL	AAA	ATH	3	1	.750	4.64	4.64	9	9	0	0	0	0	42.2	39	22	22	6	26	0	41	0	0	2	187	1.523	8.2	1.3	5.5	8.6	1.58
2026	25	-4.2	ATH	AL	Maj	ATH	1	0	1.000	3.54	3.54	12	0	6	0	0	2	20.1	14	8	8	5	11	1	21	0	0	0	83	1.230	6.2	2.2	4.9	9.3	1.91
Year	Age	AgeDif	Tm	Lg	Lev	Aff	W	L	W-L%	ERA	RA9	G	GS	GF	CG	SHO	SV	IP	H	R	ER	HR	BB	IBB	SO	HBP	BK	WP	BF	WHIP	H9	HR9	BB9	SO9	SO/W
Majors (2 seasons)					Majors		2	1	.667	5.27	5.48	17	5	6	0	0	2	42.2	40	26	25	8	22	1	39	1	0	2	187	1.453	8.4	1.7	4.6	8.2	1.77
Minors (5 seasons)					Minors		25	18	.581	4.46	4.70	87	81	1	0	0	0	417.1	371	218	207	41	191	0	475	22	5	20	1796	1.347	8.0	0.9	4.1	10.2	2.49
College (3 seasons)					College		5	7	.417	4.69	5.17	41	20		0	0	1	111.1	107	64	58	8	56	1	142	12	1	9	497	1.464	8.6	0.6	4.5	11.5	2.54
Other (1 season)					Other		1	1	.500	4.95	4.95	5	5	0	0	0	0	20.0	19	11	11	3	6	0	23	3	0	1	87	1.250	8.6	1.4	2.7	10.4	3.83
All Levels (7 Seasons)							33	27	.550	4.58	4.86	150	111	7	0	0	3	591.1	537	319	301	60	275	2	679	38	6	32	2567	1.373	8.2	0.9	4.2	10.3	2.47

AAA (2 seasons)					Minors		9	3	.750	5.73	5.73	34	32	1	0	0	0	161.2	164	103	103	23	91	0	165	6	3	9	731	1.577	9.1	1.3	5.1	9.2	1.81
AA (2 seasons)					Minors		11	9	.550	4.07	4.45	33	32	0	0	0	0	165.2	148	82	75	15	61	0	204	9	1	4	702	1.262	8.0	0.8	3.3	11.1	3.34
A+ (1 season)					Minors		4	6	.400	3.18	3.62	16	16	0	0	0	0	82.0	59	33	29	3	38	0	94	6	1	7	339	1.183	6.5	0.3	4.2	10.3	2.47
A (1 season)					Minors		1	0	1.000	0.00	0.00	3	0	0	0	0	0	7.0	0	0	0	0	1	0	11	1	0	0	21	0.143	0.0	0.0	1.3	14.1	11.00
Rk (1 season)					Minors		0	0		0.00	0.00	1	1	0	0	0	0	1.0	0	0	0	0	0	0	1	0	0	0	3	0.000	0.0	0.0	0.0	9.0