which mlb player allowed most earned runs in a single postseason

Tyler Glasnow has allowed the most earned runs in a postseason, with 20 earned runs in 2020.

	NAME	ER	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	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
2	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
3	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
4	C.J. Wilson	18	2011	TEX	6	0	3	.000	5	5.79	26	0	0	0	28.0	29	21	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
5	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
6	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
7	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
8	Framber Valdez F. Valdez	17	2021	HOU	5	1	1	.500	5	7.78	16	0	0	0	19.2	28	18	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
9	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
10	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
11	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
12	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
13	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
14	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
15	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
16	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
17	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
18	Jarrod Washburn J. Washburn	16	2002	ANA	5	1	2	.333	5	5.02	17	0	0	0	28.2	30	17	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
19	Patrick Corbin P. Corbin	15	2019	WSH	8	2	3	.400	3	5.79	36	0	0	0	23.1	21	16	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
20	Johnny Cueto J. Cueto	15	2015	KCR	4	2	1	.667	4	5.40	19	1	0	0	25.0	17	15	3	10	1	0	0	101	0	6.84	3.60	1.90	1.08	18.8	9.9	1.08	.206	5.40	6.12
21	Yordano Ventura Y. Ventura	15	2015	KCR	5	0	2	.000	5	6.43	22	0	0	0	21.0	27	15	5	8	1	0	1	98	0	9.43	3.43	2.75	2.14	22.4	8.2	1.67	.355	6.43	11.57
22	CC Sabathia	15	2007	CLE	3	1	2	.333	3	8.80	14	0	0	0	15.1	21	15	3	13	3	0	2	77	1	8.22	7.63	1.08	1.76	18.2	16.9	2.22	.409	8.80	12.33
23	Pedro Martinez P. Martinez	15	2003	BOS	4	1	1	.500	4	4.76	23	0	0	0	28.1	29	15	3	7	2	0	0	119	0	7.31	2.22	3.29	0.95	19.3	5.9	1.27	.310	4.76	9.21
24	Kevin Appier K. Appier	15	2002	ANA	5	0	1	.000	5	6.23	10	0	0	0	21.2	24	15	5	12	1	0	1	99	2	4.15	4.98	0.83	2.08	10.1	12.1	1.66	.268	6.23	9.97
25	Andy Pettitte A. Pettitte	15	2001	NYY	5	2	3	.400	5	4.55	21	0	0	0	29.2	30	15	2	6	1	0	1	122	0	6.37	1.82	3.50	0.61	17.2	4.9	1.21	.304	4.55	9.10