How to read this player page

The big number is his career NUT, his total production against league average, with its letter grade. This season's NUT sits just below it, followed by his season and career lines, recent form over 7, 14 and 30 days, game logs, and percentile ranks against every qualified player. NUT is built on the advanced hitting and pitching stats analysts trust, with defense left out, so the number reflects what the player controls.

Roy Mahaffey 2026 Season · BAL

Roy Mahaffey played in the majors from 1926 to 1936. His career NUT is -6.8, #7,026 of 7,125 pitchers since 1876, and his best season by NUT was 1933 (+0.1). NUT is one number for production against league average: 0.0 is average, and every season is graded against its own league.

Career: 67-49, 5.01 ERA, 365 K in 1056.0 IP.

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Roy Mahaffey Career Stats & NUT | Baseball NUT

Roy Mahaffey

#15

P · BAL

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-6.8Career NUT

+4.8 to Weak

Career

5.01ERA1.55WHIP67W365K1056.0IP5SV

Career · season grades

R/R · 6' 0", 180 lb · b. Feb 9, 1904 · Belton, SC · Signed Undrafted FA, 1926

Player Overview

Year by Year


1926	22	PIT	—	0	0	0.00	4	0	0	3	0	20	4.2	5	0	1	1	3	1.29
1927	23	PIT	—	1	0	7.71	2	1	0	1	0	45	9.1	9	8	9	3	4	1.93
1930	26	PHA	-1.2	9	5	5.01	33	17	6	4	0	697	152.2	186	85	53	4	38	1.57
1931	27	PHA	-1.0	15	4	4.21	30	20	8	5	2	714	162.1	161	76	82	3	59	1.50
1932	28	PHA	-2.3	13	13	5.09	37	28	13	5	0	1003	222.2	245	126	96	5	106	1.53
1933	29	PHA	+0.1	13	10	5.17	33	23	9	4	0	813	179.1	198	103	74	4	66	1.52
1934	30	PHA	-0.9	6	7	5.37	37	14	3	15	2	577	129.0	142	77	55	1	37	1.53
1935	31	PHA	-0.5	8	4	3.90	27	17	5	4	0	595	136.0	153	59	42	5	39	1.43
1936	32	SLB	-1.0	2	6	8.10	21	9	1	5	1	304	60.0	82	54	40	1	13	2.03
Career	—	9 yrs	-6.8	67	49	5.01	224	129	45	46	5	4768	1056.0	1181	588	452	27	365	1.55

Stat definitions →

NUT Breakdown

K Ability

HR Prevention

Walk Avoidance

What's driving Mahaffey's career NUT of -6.8

Slice size = share of total NUT. K Ability = Strikeouts · HR Prevention = HR allowed · Walk Avoidance = BB + HBP.

Career NUT Trend

0.1

30313233343536

NUT by Season

-1.2

-1.0

-2.3

+0.1

-0.9

-0.5

-1.0

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