mlb player allowed most runs in a single postseason

C.J. Wilson has allowed the most runs in a postseason, with 21 runs in 2011.

	NAME	R	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	C.J. Wilson	21	2011	TEX	6	0	3	.000	5	5.79	26	0	0	0	28.0	29	18	6	19	3	0	5	130	3	8.36	6.11	1.37	1.93	20.0	14.6	1.71	.303	6.75	9.32
2	Tyler Glasnow T. Glasnow	20	2020	TBR	6	2	3	.400	6	6.28	40	0	0	0	28.2	26	20	9	17	0	0	0	126	6	12.56	5.34	2.35	2.83	31.7	13.5	1.50	.283	6.28	8.16
3	Jack Morris J. Morris	19	1992	TOR	4	0	3	.000	4	7.43	18	1	0	0	23.0	24	19	6	15	0	0	2	105	2	7.04	5.87	1.20	2.35	17.1	14.3	1.70	.273	7.43	9.39
4	Deacon Phillippe D. Phillippe	19	1903	PIT	5	3	2	.600	5	3.07	22	5	0	0	44.0	38	15	0	3	1	0	0	178	1	4.50	0.61	7.33	0.00	12.4	1.7	0.93	.250	3.89	7.77
5	Jack Flaherty J. Flaherty	18	2024	LAD	5	1	2	.333	5	7.36	15	0	0	0	22.0	24	18	6	9	1	0	0	98	0	6.14	3.68	1.67	2.45	15.3	9.2	1.50	.269	7.36	9.82
6	Framber Valdez F. Valdez	18	2021	HOU	5	1	1	.500	5	7.78	16	0	0	0	19.2	28	17	6	8	2	0	0	92	0	7.32	3.66	2.00	2.75	17.4	8.7	1.83	.367	8.24	12.81
7	Kevin Brown K. Brown	18	1997	FLA	5	2	2	.500	5	4.91	22	1	0	0	33.0	35	18	4	10	1	0	0	138	0	6.00	2.73	2.20	1.09	15.9	7.2	1.36	.307	4.91	9.55
8	Orel Hershiser O. Hershiser	18	1997	CLE	5	0	2	.000	5	5.72	16	0	0	0	28.1	33	18	4	9	1	0	0	120	0	5.08	2.86	1.78	1.27	13.3	7.5	1.48	.322	5.72	10.48
9	Zac Gallen Z. Gallen	17	2023	ARI	6	2	3	.400	6	4.54	24	0	0	0	33.2	31	17	6	14	1	0	0	141	2	6.42	3.74	1.71	1.60	17.0	9.9	1.34	.260	4.54	8.29
10	Justin Verlander J. Verlander	17	2019	HOU	6	1	4	.200	6	4.33	38	0	0	0	35.1	30	17	8	14	0	0	0	146	0	9.68	3.57	2.71	2.04	26.0	9.6	1.25	.256	4.33	7.64
11	James Shields J. Shields	17	2014	KCR	5	1	2	.333	5	6.12	20	0	0	0	25.0	36	17	4	7	1	0	0	117	3	7.20	2.52	2.86	1.44	17.1	6.0	1.72	.376	6.12	12.96
12	Justin Verlander J. Verlander	17	2006	DET	4	1	2	.333	4	5.82	23	0	0	0	21.2	26	14	5	10	0	0	0	100	3	9.55	4.15	2.30	2.08	23.0	10.0	1.66	.339	7.06	10.80
13	Jarrod Washburn J. Washburn	17	2002	ANA	5	1	2	.333	5	5.02	17	0	0	0	28.2	30	16	6	10	1	0	2	124	0	5.34	3.14	1.70	1.88	13.7	8.1	1.40	.267	5.34	9.42
14	Al Leiter A. Leiter	17	1997	FLA	5	0	1	.000	4	5.48	19	0	0	0	23.0	30	14	3	15	0	0	1	110	1	7.43	5.87	1.27	1.17	17.3	13.6	1.96	.370	6.65	11.74
15	Andy Pettitte A. Pettitte	17	1996	NYY	5	2	1	.667	5	4.78	15	0	0	0	32.0	25	17	7	15	0	0	0	133	1	4.22	4.22	1.00	1.97	11.3	11.3	1.25	.188	4.78	7.03
16	Tommy Greene T. Greene	17	1993	PHI	3	1	1	.500	3	13.11	8	0	0	0	11.2	19	17	3	11	0	0	0	62	0	6.17	8.49	0.73	2.31	12.9	17.7	2.57	.400	13.11	14.66
17	Roger Clemens R. Clemens	17	1986	BOS	5	1	1	.500	5	3.97	28	0	0	0	34.0	31	15	1	13	2	0	0	146	0	7.41	3.44	2.15	0.26	19.2	8.9	1.29	.294	4.50	8.21
18	Don Sutton D. Sutton	17	1978	LAD	3	0	3	.000	3	7.13	8	0	0	0	17.2	24	14	2	6	0	0	0	83	1	4.08	3.06	1.33	1.02	9.6	7.2	1.70	.328	8.66	12.23
19	Lew Burdette L. Burdette	17	1958	MIL	3	1	2	.333	3	5.64	12	1	0	0	22.1	22	14	5	4	0	0	3	93	0	4.84	1.61	3.00	2.01	12.9	4.3	1.16	.236	6.85	8.87
20	Patrick Corbin P. Corbin	16	2019	WSH	8	2	3	.400	3	5.79	36	0	0	0	23.1	21	15	2	12	1	0	1	103	0	13.89	4.63	3.00	0.77	35.0	11.7	1.41	.365	6.17	8.10
21	David Price D. Price	16	2015	TOR	4	1	2	.333	3	6.17	23	0	0	0	23.1	22	16	4	3	2	0	0	95	0	8.87	1.16	7.67	1.54	24.2	3.2	1.07	.286	6.17	8.49
22	Shaun Marcum S. Marcum	16	2011	MIL	3	0	3	.000	3	14.90	5	0	0	0	9.2	17	16	3	5	0	0	1	49	0	4.66	4.66	1.00	2.79	10.2	10.2	2.28	.389	14.90	15.83
23	A.J. Burnett	16	2009	NYY	5	1	1	.500	5	5.27	24	0	0	0	27.1	22	16	1	16	5	0	1	122	2	7.90	5.27	1.50	0.33	19.7	13.1	1.39	.276	5.27	7.24
24	Cole Hamels C. Hamels	16	2009	PHI	4	1	2	.333	4	7.58	15	0	0	0	19.0	25	16	7	4	1	0	0	86	0	7.11	1.89	3.75	3.32	17.4	4.7	1.53	.305	7.58	11.84
25	Russ Ortiz R. Ortiz	16	2002	SFG	5	2	0	1.000	5	5.76	13	0	0	0	25.0	27	16	3	13	0	0	1	114	3	4.68	4.68	1.00	1.08	11.4	11.4	1.60	.282	5.76	9.72