Mason Miller

Position: Relief Pitcher

Bats: Right • Throws: Right

6-5, 220lb (196cm, 99kg)

Born: August 24, 1998 in Pittsburgh, PA us

Draft: Drafted by the Oakland Athletics in the 3rd round of the 2021 MLB June Amateur Draft from Gardner-Webb University (Boiling Springs, NC).

Schools: Gardner-Webb University (Boiling Springs, NC), Waynesburg University (Waynesburg, PA)

Rookie Status: Exceeded rookie limits during 2024 season

2026 Contract Status: Signed thru 2026, 1 yr/$4M (26)

Service Time (01/2026): 2.166 • Arb Eligible: 2027 • Free Agent: 2030

Full Name: Mason James Miller

Nicknames: The Reaper

Instagram: @mason.j.miller

View Player Info from the B-R Bullpen

2x All-Star

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SUMMARY

2026

Career

WAR

2.2

7.6

ERA

0.93

2.45

162

38.2

198.2

317

WHIP

0.802

0.926

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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
2017	18	-1.9	Waynesburg	PRES	NCAA		1	4	.200	7.03	7.88	13	4		1	0	3	32.0	42	28	25	0	15	1	42	5	0	9	155	1.781	11.8	0.0	4.2	11.8	2.80
2018	19	-0.8	Waynesburg	PRES	NCAA		1	5	.167	7.16	10.47	9	7		0	0	0	32.2	38	38	26	1	28	0	22	9	0	5	173	2.020	10.5	0.3	7.7	6.1	0.79
2019	20	-0.5	Waynesburg	PRES	NCAA		7	2	.778	1.86	2.53	11	11		6	4	0	67.2	40	19	14	1	31	0	97	12	0	6	280	1.049	5.3	0.1	4.1	12.9	3.13
2020	21	0.2	Waynesburg	PRES	NCAA		1	0	1.000	3.21	3.21	2	2		2	0	0	14.0	8	5	5	1	8	0	24	1	0	6	59	1.143	5.1	0.6	5.1	15.4	3.00
2021	22	1.1	Gardner-Webb	BigS	NCAA		8	1	.889	3.30	3.79	15	14		0	0	0	92.2	73	39	34	6	30	0	121	12	0	11	396	1.112	7.1	0.6	2.9	11.8	4.03
2021	22	1.1	Athletics	ACL	Rk	OAK	0	1	.000	1.50	1.50	3	2	0	0	0	0	6.0	4	1	1	0	3	0	9	0	0	1	24	1.167	6.0	0.0	4.5	13.5	3.00
2022	23		3 Teams	3 Lgs	A+-AAA-Rk	OAK	0	2	.000	3.86	3.86	6	6	0	0	0	0	14.0	8	6	6	3	3	0	25	0	0	0	50	0.786	5.1	1.9	1.9	16.1	8.33
2022	23	-4.2	Las Vegas	PCL	AAA	OAK	0	1	.000	5.40	5.40	2	2	0	0	0	0	5.0	5	3	3	2	1	0	7	0	0	0	18	1.200	9.0	3.6	1.8	12.6	7.00
2022	23	-0.1	Lansing	MIDW	A+	OAK	0	1	.000	3.86	3.86	3	3	0	0	0	0	7.0	3	3	3	1	2	0	13	0	0	0	26	0.714	3.9	1.3	2.6	16.7	6.50
2022	23	1.8	Athletics	ACL	Rk	OAK	0	0		0.00	0.00	1	1	0	0	0	0	2.0	0	0	0	0	0	0	5	0	0	0	6	0.000	0.0	0.0	0.0	22.5
2022	23	-0.2	Mesa	AZFL	Fal		1	1	.500	3.24	3.24	6	6	0	0	0	0	16.2	9	6	6	1	4	0	20	2	1	1	63	0.780	4.9	0.5	2.2	10.8	5.00
2023	24		3 Teams	3 Lgs	AAA-A-AA	OAK	1	0	1.000	1.86	1.86	7	7	0	0	0	0	19.1	8	4	4	3	5	0	35	0	1	1	70	0.672	3.7	1.4	2.3	16.3	7.00
2023	24	-3.3	Las Vegas	PCL	AAA	OAK	1	0	1.000	0.00	0.00	4	4	0	0	0	0	12.0	3	0	0	0	3	0	23	0	1	1	42	0.500	2.3	0.0	2.3	17.3	7.67
2023	24	-0.6	Midland	TL	AA	OAK	0	0		4.91	4.91	1	1	0	0	0	0	3.2	2	2	2	2	0	0	8	0	0	0	13	0.545	4.9	4.9	0.0	19.6
2023	24	2.1	Stockton	CALL	A	OAK	0	0		4.91	4.91	2	2	0	0	0	0	3.2	3	2	2	1	2	0	4	0	0	0	15	1.364	7.4	2.5	4.9	9.8	2.00
2023	24	-4.7	OAK	AL	Maj	OAK	0	3	.000	3.78	4.05	10	6	0	0	0	0	33.1	24	15	14	2	16	0	38	3	0	3	139	1.200	6.5	0.5	4.3	10.3	2.38
2024	25	-4.0	OAK	AL	Maj	OAK	2	2	.500	2.49	3.18	55	0	44	0	0	28	65.0	36	23	18	6	21	3	104	1	0	2	249	0.877	5.0	0.8	2.9	14.4	4.95
2025	26		2 Teams	2 Lgs	Maj	ATH	1	2	.333	2.63	2.77	60	0	37	0	0	22	61.2	28	19	18	5	28	2	104	1	1	3	234	0.908	4.1	0.7	4.1	15.2	3.71
2025	26	-3.2	ATH	AL	Maj	ATH	1	2	.333	3.76	3.99	38	0	32	0	0	20	38.1	21	17	16	4	18	2	59	1	1	3	151	1.017	4.9	0.9	4.2	13.9	3.28
2025	26	-3.1	SDP	NL	Maj	SDP	0	0		0.77	0.77	22	0	5	0	0	2	23.1	7	2	2	1	10	0	45	0	0	0	83	0.729	2.7	0.4	3.9	17.4	4.50
2026	27	-2.3	SDP	NL	Maj	SDP	2	1	.667	0.93	1.40	37	0	33	0	0	24	38.2	18	6	4	0	13	0	71	1	0	3	146	0.802	4.2	0.0	3.0	16.5	5.46
2026	27	-1.7	United States	WBC	WBC		0	0		0.00	0.00	4	0	4	0	0	2	4.0	0	0	0	0	2	0	10	0	0	1	14	0.500	0.0	0.0	4.5	22.5	5.00
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 (4 seasons)					Majors		5	8	.385	2.45	2.85	162	6	114	0	0	74	198.2	106	63	54	13	78	5	317	6	1	11	768	0.926	4.8	0.6	3.5	14.4	4.06
Minors (3 seasons)					Minors		1	3	.250	2.52	2.52	16	15	0	0	0	0	39.1	20	11	11	6	11	0	69	0	1	2	144	0.788	4.6	1.4	2.5	15.8	6.27
College (5 seasons)					College		18	12	.600	3.92	4.86	50	38		9	4	3	239.0	201	129	104	9	112	1	306	39	0	37	1063	1.310	7.6	0.3	4.2	11.5	2.73
Other (2 seasons)					Other		1	1	.500	2.61	2.61	10	6	4	0	0	2	20.2	9	6	6	1	6	0	30	2	1	2	77	0.726	3.9	0.4	2.6	13.1	5.00
All Levels (10 Seasons)							25	24	.510	3.16	3.78	238	65	118	9	4	79	497.2	336	209	175	29	207	6	722	47	3	52	2052	1.091	6.1	0.5	3.7	13.1	3.49

AAA (2 seasons)					Minors		1	1	.500	1.59	1.59	6	6	0	0	0	0	17.0	8	3	3	2	4	0	30	0	1	1	60	0.706	4.2	1.1	2.1	15.9	7.50
AA (1 season)					Minors		0	0		4.91	4.91	1	1	0	0	0	0	3.2	2	2	2	2	0	0	8	0	0	0	13	0.545	4.9	4.9	0.0	19.6
A+ (1 season)					Minors		0	1	.000	3.86	3.86	3	3	0	0	0	0	7.0	3	3	3	1	2	0	13	0	0	0	26	0.714	3.9	1.3	2.6	16.7	6.50
A (1 season)					Minors		0	0		4.91	4.91	2	2	0	0	0	0	3.2	3	2	2	1	2	0	4	0	0	0	15	1.364	7.4	2.5	4.9	9.8	2.00
Rk (2 seasons)					Minors		0	1	.000	1.13	1.13	4	3	0	0	0	0	8.0	4	1	1	0	3	0	14	0	0	1	30	0.875	4.5	0.0	3.4	15.8	4.67
Fal (1 season)					Other		1	1	.500	3.24	3.24	6	6	0	0	0	0	16.2	9	6	6	1	4	0	20	2	1	1	63	0.780	4.9	0.5	2.2	10.8	5.00
NCAA (5 seasons)					College		18	12	.600	3.92	4.86	50	38		9	4	3	239.0	201	129	104	9	112	1	306	39	0	37	1063	1.310	7.6	0.3	4.2	11.5	2.73
NCAA (5 seasons)					College		18	12	.600	3.92	4.86	50	38		9	4	3	239.0	201	129	104	9	112	1	306	39	0	37	1063	1.310	7.6	0.3	4.2	11.5	2.73
WBC (1 season)					Other		0	0		0.00	0.00	4	0	4	0	0	2	4.0	0	0	0	0	2	0	10	0	0	1	14	0.500	0.0	0.0	4.5	22.5	5.00