MLB / Players

Roy Mahaffey

HandednessBats Right · Throws Right

Listed at6 ft 0 in · 180 lb

BornFebruary 9, 1904 · Belton, SC, USA

MLB debutAugust 31, 1926

Final gameJuly 28, 1936

Seasons9 (1926–1936)

Pittsburgh Pirates 1926–1927; Philadelphia Athletics 1930–1935; St. Louis Browns 1936

Percentile snapshot

1933 season — qualified pitchers

54.5

50.5

66.7

44.4

38.4

SHO

198

45.5

103

8.1

24.2

59.6

179.3

49.5

ERA

5.17

WHIP

1.517

8.1

K/9

3.31

47.5

FIP

3.96

40.4

FIP-

91.8

71.7

ERA+

83.5

6.1

sWAR

0.1

8.1

of 100 qualified 1933 pitchers (min 152 IP)

Career, era-adjusted

ERA+

90.4

sWAR

4.7

78.6

ERA+ measured against qualified careers (1,000+ IP), 1,334 of them; sWAR measured against every career in history, 24,011 of them. Only era-adjusted career stats carry a percentile — a raw career total gets a rank instead, because pooling the 1890s with the 2020s is a choice, not a measurement.

Season by season

Batting

Season	G	PA	AB	R	H	2B	3B	HR	RBI	BB	SO	BA	OBP	SLG	OPS	wRC+	OPS+	wOBA	sWAR
1926	4	2	2	0	0	0	0	0	0	0	0	.000	.000	.000	.000	-124.3	-100.0	.000	0.2
1927	2	5	5	0	2	0	0	0	1	0	3	.400	.400	.400	.800	109.6	109.4	.372	-0.2
1930	33	59	59	2	7	1	0	1	7	0	21	.119	.119	.186	.305	-32.3	-24.3	.133	0.6
1931	30	70	63	7	12	2	0	2	8	4	25	.190	.239	.317	.556	38.5	43.1	.256	2.2
1932	37	92	87	7	15	1	1	1	6	3	37	.172	.200	.241	.441	7.1	13.1	.203	0.8
1933	33	69	65	4	14	1	0	0	6	2	23	.215	.239	.231	.470	19.8	24.3	.222	0.1
1934	37	50	48	5	13	2	0	0	4	2	5	.271	.300	.313	.613	57.2	59.7	.287	0.2
1935	27	54	51	3	9	1	0	0	1	2	18	.176	.208	.196	.404	-3.9	4.3	.193	2.0
1936	21	17	16	0	1	1	0	0	0	1	7	.063	.118	.125	.243	-50.1	-41.6	.121	-1.1

Pitching

Season	G	GS	W	L	SV	CG	H	ER	BB	SO	HR	IP	ERA	WHIP	K/9	FIP	FIP-	ERA+	sWAR
1926	4	0	0	0	0	0	5	0	1	3	0	4.7	0.00	1.286	5.79	2.91	73.7	—	0.2
1927	2	1	1	0	0	0	9	8	9	4	0	9.3	7.71	1.929	3.86	5.03	122.1	53.4	-0.2
1930	33	16	9	5	0	6	186	85	53	38	16	152.7	5.01	1.566	2.24	5.43	116.2	93.4	0.6
1931	30	20	15	4	2	8	161	76	82	59	9	162.3	4.21	1.497	3.27	4.82	107.1	106.8	2.2
1932	37	28	13	13	0	13	245	126	96	106	27	222.7	5.09	1.531	4.28	5.11	112.7	89.1	0.8
1933	33	23	13	10	0	9	198	103	74	66	5	179.3	5.17	1.517	3.31	3.96	91.8	83.5	0.1
1934	37	14	6	7	2	3	142	77	55	37	10	129.0	5.37	1.527	2.58	4.89	110.9	82.1	0.2
1935	27	17	8	4	0	5	153	59	42	39	11	136.0	3.90	1.434	2.58	4.61	102.4	115.2	2.0
1936	21	9	2	6	1	1	82	54	40	13	6	60.0	8.10	2.033	1.95	6.41	120.9	65.4	-1.1

sWAR is the season TOTAL for a player who both hit and pitched: the record book carries one figure per season, not a split, so the same number appears on both lines rather than being counted twice.

Career totals

Batting

224

418

396

RBI

139

.1843

OBP

.2122

SLG

.2424

OPS

.4546

Pitching

G (P)

224

128

SHO

1,056

SO (P)

365

BB allowed

452

ERA

5.011

WHIP

1.5464

K/9

3.11

A total is called out only where it ranks in the all-time top 500; hover a figure for its rank and the size of the field it was ranked in. Ranks are absolute facts and carry no percentile — the population for "career home runs" would be an editorial choice, and the rank is not.

Best games

Batting

Date	Game	AB	R	H	HR	RBI	TB
1931-05-30	ATH @ BOS Gameday	4	1	2	1	2	5
1930-06-06	ATH @ BAL Gameday	4	1	1	1	2	4
1931-07-16	DET @ ATH Gameday	3	1	1	1	1	4
1932-07-25	NYY @ ATH Gameday	4	1	1	1	1	4
1930-07-13	ATH @ BAL Gameday	5	0	3	0	2	3

Pitching

Date	Game	IP	H	R	ER	BB	SO	HR
1933-09-05	NYY @ ATH Gameday	9.0	3	1	1	4	8	0
1932-05-28	ATH @ BOS Gameday	9.0	7	2	2	3	7	0
1932-07-25	NYY @ ATH Gameday	9.0	10	7	7	2	7	2
1932-08-27	BAL @ ATH Gameday	9.0	10	2	2	3	7	1
1932-07-08	CWS @ ATH Gameday	9.0	5	2	2	7	6	1

Ranked from our own play-by-play game log, which begins in 1901 — not from the record book, so a career played outside it shows nothing here rather than a short list.