Kieran McKenna had the lowest winning percentage by a manager in the Premier League with 30+ appearances, winning 10.5 percent of the time.

lowest winning percentage manager career 30 or more games

	COACH	W%	M	W	D	L	G	GC	XG	XGA	SH	SOT	PASS-ATT	PASS	POSS%	FOUL	YC	RC
1	Kieran McKenna	.105	38	4	10	24	36	82	35.20	74.98	376	127	13,510	10,884	40.3	430	93	5
2	John Gorman	.119	42	5	15	22	47	100									39	1
3	Vincent Kompany	.132	38	5	9	24	41	78	41.25	72.24	433	143	16,459	13,165	47.4	427	77	7
4	Aidy Boothroyd	.132	38	5	13	20	29	59			418	135	10,175		45.6	597	49	2
5	Daniel Farke	.155	58	9	10	39	40	115			638	193	24,957	19,991	47.8	555	104	4
6	Rob Edwards	.158	38	6	8	24	52	85	43.93	81.46	431	141	13,352	10,226	42.1	443	71	0
7	Micky Adams	.163	43	7	18	18	54	74									70	7
8	Mauricio Pellegrino	.167	30	5	13	12	29	44			364	106	14,300	11,248	54.0	323	41	0
9	Iain Dowie	.169	59	10	17	32	57	94							46.5		91	6
10	David Wagner	.183	60	11	15	34	41	95			612	181	24,582	18,383	47.1	643	98	6
11	Nigel Worthington	.184	38	7	12	19	42	77									35	2
12	Phil Brown	.194	67	13	20	34	66	125			764	238	20,589		44.3	1,007	129	8
13	Egil Roger Olsen	.194	36	7	11	18	44	70									46	4
14	Mick McCarthy	.196	138	27	28	83	127	241							49.0		241	13
15	Scott Parker	.197	61	12	14	35	49	104			640	203	26,742	21,615	46.8	713	109	4
16	John Deehan	.197	61	12	23	26	66	89									79	3
17	Dave Bassett	.197	142	28	50	64	141	210									217	11
18	Nigel Adkins	.200	30	6	9	15	38	56			382	125	12,226		48.3	306	28	0
19	Steve Cooper	.209	67	14	20	33	70	121	71.41	115.80	670	210	23,341	17,778	39.5	776	159	2
20	Tony Mowbray	.211	38	8	8	22	36	67			559	165	14,537		50.3	481	67	1
21	Steve Kean	.220	59	13	14	32	72	110			708	216	18,685		42.1	720	108	9
22	Chris Wilder	.222	90	20	19	51	79	149			842	292	32,722	24,409	40.0	1,016	171	8
23	Gary Megson	.224	134	30	37	67	134	211							42.5		227	9
24	Colin Todd	.231	91	21	20	50	91	158									144	9
25	Gus Poyet	.233	60	14	21	25	59	87			697	211	23,545		46.6	700	136	9