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.

J.A. Happ 2026 Season · STL

J.A. Happ is a free agent pitcher. His career NUT is -2.9, #6,419 of 7,125 pitchers since 1876, and his best season by NUT was 2015 (+1.1). NUT is one number for production against league average: 0.0 is average, and every season is graded against its own league.

Career: 133-100, 4.13 ERA, 1661 K in 1893.2 IP.

NUT leaderboard · What is NUT?

J.A. Happ Career Stats & NUT | Baseball NUT

J.A. Happ

P · Free agent

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-2.9Career NUT

+0.9 to Weak

Career

4.13ERA1.31WHIP133W1661K1893.2IP

Career · season grades

L/L · 6' 5", 205 lb · b. Oct 19, 1982 · Peru, IL · Draft 2004 (3rd Rd, #92)

Player Overview

Year by Year


2007	24	PHI	—	0	1	11.25	1	1	0	0	0	0	21	4.0	7	5	2	0	5	2.25
2008	25	PHI	+0.1	1	0	3.69	8	4	0	0	1	1	138	31.2	28	13	14	1	26	1.33
2009	26	PHI	+0.0	12	4	2.93	35	23	3	2	4	0	685	166.0	149	54	56	5	119	1.23
2010	27	PHI	—	1	0	1.76	3	3	0	0	0	0	70	15.1	13	3	12	0	9	1.63
2010	27	HOU	-0.1	5	4	3.75	13	13	1	1	0	0	304	72.0	60	30	35	1	61	1.32
2010	27	TOT	-0.2	6	4	3.40	16	16	1	1	0	0	374	87.1	73	33	47	1	70	1.37
2011	28	HOU	-1.4	6	15	5.35	28	28	0	0	0	0	698	156.1	157	93	83	2	134	1.54
2012	29	HOU	-0.6	7	9	4.83	18	18	0	0	0	0	457	104.1	112	56	39	1	98	1.45
2012	29	TOR	+0.6	3	2	4.69	10	6	0	0	3	1	170	40.1	35	21	17	1	46	1.29
2012	29	TOT	+0.0	10	11	4.79	28	24	0	0	3	1	627	144.2	147	77	56	2	144	1.40
2013	30	TOR	-0.5	5	7	4.56	18	18	0	0	0	0	415	92.2	91	47	45	2	77	1.47
2014	31	TOR	-1.0	11	11	4.22	30	26	0	0	2	0	673	158.0	160	74	51	2	133	1.34
2015	32	SEA	-0.2	4	6	4.64	21	20	0	0	0	0	468	108.2	121	56	32	2	82	1.41
2015	32	PIT	+1.3	7	2	1.85	11	11	0	0	0	0	249	63.1	52	13	13	0	69	1.03
2015	32	TOT	+1.1	11	8	3.61	32	31	0	0	0	0	717	172.0	173	69	45	2	151	1.27
2016	33	TOR	+0.5	20	4	3.18	32	32	0	0	0	0	796	195.0	168	69	60	6	163	1.17
2017	34	TOR	+1.0	10	11	3.53	25	25	0	0	0	0	626	145.1	145	57	46	0	142	1.31
2018	35	TOR	+0.4	10	6	4.18	20	20	0	0	0	0	475	114.0	99	53	35	4	130	1.18
2018	35	NYY	+0.0	7	0	2.69	11	11	0	0	0	0	258	63.2	51	19	16	5	63	1.05
2018	35	TOT	+0.4	17	6	3.65	31	31	0	0	0	0	733	177.2	150	72	51	9	193	1.13
2019	36	NYY	-1.2	12	8	4.91	31	30	0	0	0	0	678	161.1	160	88	49	5	140	1.30
2020	37	NYY	-0.1	2	2	3.47	9	9	0	0	0	0	196	49.1	37	19	15	1	42	1.05
2021	38	MIN	-1.3	5	6	6.77	19	19	0	0	0	0	445	98.1	125	74	31	3	77	1.59
2021	38	STL	-0.2	5	2	4.00	11	11	0	0	0	0	226	54.0	52	24	17	0	45	1.28
2021	38	TOT	-1.5	10	8	5.79	30	30	0	0	0	0	671	152.1	177	98	48	3	122	1.48
Career	—	15 yrs	-2.9	133	100	4.13	354	328	4	3	10	2	8048	1893.2	1822	868	668	41	1661	1.31

Stat definitions →

NUT Breakdown

K Ability

HR Prevention

Walk Avoidance

What's driving Happ's career NUT of -2.9

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

Career NUT Trend

1.1

0809101112131415161718192021

NUT by Season

+0.1

+0.0

-0.2

-1.4

+0.0

-0.5

-1.0

+1.1

+0.5

+1.0

+0.4

-1.2

-0.1

-1.5

Awards

2008World Series Champion* · Baseball America Triple-A All-Star

2009Baseball America Major League All-Rookie Team · Phillies Pitcher of the Year · MLB Players Choice NL Outstanding Rookie · Rookie of the Year - MLB.com Awards

2018AL All-Star · Blue Jays Pitcher of the Year

Minor League

Year	Age	Lv	W	L	ERA	G	GS	GF	BF	IP	H	ER	BB	HBP	SO	WHIP
2005	22	A	4	4	2.36	14	12	0	300	72.1	57	19	26	5	70	1.15
2005	22	AA	1	0	1.50	1	1	0	23	6.0	3	1	2	0	8	0.83
2006	23	A+	3	7	2.81	13	13	0	319	80.0	63	25	19	2	77	1.03
2006	23	AA	6	2	2.65	12	12	0	307	74.2	58	22	29	3	81	1.17
2006	23	AAA	1	0	1.50	1	1	0	24	6.0	3	1	1	1	4	0.67
2007	24	AAA	4	6	5.02	24	24	0	515	118.1	118	66	62	0	117	1.52
2008	25	AAA	8	7	3.60	24	23	1	552	135.0	116	54	48	1	151	1.21
2010	27	A+	0	1	6.00	1	1	0	13	3.0	3	2	0	0	2	1.00
2010	27	AA	1	0	8.03	3	3	0	59	12.1	18	11	4	1	10	1.78
2010	27	AAA	0	1	4.84	5	4	0	106	22.1	26	12	15	0	22	1.84
2011	28	AAA	1	0	1.50	3	3	0	71	18.0	11	3	9	0	16	1.11
2013	30	A+	0	0	0.00	1	1	0	17	5.0	3	0	0	0	7	0.60
2013	30	AAA	0	2	6.75	3	3	0	62	13.1	17	10	8	0	13	1.88
2014	31	A+	1	0	3.60	1	1	0	18	5.0	3	2	1	0	5	0.80
2014	31	AAA	0	0	1.93	1	1	0	20	4.2	5	1	2	0	6	1.50
2017	34	A+	0	0	9.00	1	1	0	16	3.0	7	3	0	0	3	2.33

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