Thurman Munson had the most at-bats by an AL catcher in 1978, with 617 at-bats.

Interpreted as:

most ab by a player in by al catcher in 1978

	NAME	AB	SEASON	TM	G	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Thurman Munson T. Munson	617	1978	NYY	154	73	183	27	1	6	71	35	3	70	2	3	666	230	34	1	10	6	20	.297	.332	.373	.705	72	-0.4	.317	99	-0.5
2	Carlton Fisk C. Fisk	571	1978	BOS	157	94	162	39	5	20	88	71	7	83	7	2	658	271	64	3	6	6	10	.284	.366	.475	.841	100	28.6	.375	129	21.3
3	Darrell Porter D. Porter	520	1978	KCR	150	77	138	27	6	18	78	75	2	75	0	5	602	231	51	1	4	14	13	.265	.358	.444	.802	82	17.1	.355	121	14.4
4	Jim Sundberg J. Sundberg	518	1978	TEX	149	54	144	23	6	6	58	64	3	70	2	5	592	197	35	3	4	6	18	.278	.358	.380	.739	72	8.2	.336	109	6.2
5	Gary Alexander G. Alexander	498	1978	TOT	148	57	112	20	4	27	84	57	2	166	0	5	563	221	51	1	5	5	11	.225	.304	.444	.748	68	6.6	.333	109	5.5
6	Butch Wynegar B. Wynegar	454	1978	MIN	135	36	104	22	1	4	45	47	6	42	1	0	522	140	27	11	4	2	7	.229	.307	.308	.616	44	-12.3	.286	74	-15.3
7	Rick Dempsey R. Dempsey	441	1978	BAL	136	41	114	25	0	6	32	48	0	54	7	3	498	157	31	3	6	2	11	.259	.327	.356	.683	52	-1.9	.313	98	-0.9
8	Brian Downing B. Downing	412	1978	CAL	133	42	105	15	0	7	46	52	6	47	3	2	476	141	22	4	2	2	14	.255	.345	.342	.688	52	0.9	.320	102	1.3
9	Bob Stinson B. Stinson	364	1978	SEA	124	46	94	14	3	11	55	45	6	42	2	1	423	147	28	4	4	1	10	.258	.346	.404	.750	54	7.9	.342	112	5.5
10	Milt May M. May	352	1978	DET	105	24	88	9	0	10	37	27	2	26	0	0	387	127	19	4	2	3	13	.250	.305	.361	.666	38	-4.4	.303	84	-7
11	Bill Nahorodny B. Nahorodny	347	1978	CWS	107	29	82	11	2	8	35	23	2	52	1	0	380	121	21	4	4	0	5	.236	.285	.349	.633	33	-8.3	.289	77	-9.6
12	Lance Parrish L. Parrish	288	1978	DET	85	37	63	11	3	14	41	11	3	71	0	0	304	122	28	1	1	0	8	.219	.254	.424	.678	30	-3.3	.303	84	-5.4
13	Rick Cerone R. Cerone	282	1978	TOR	88	25	63	8	2	3	20	23	1	32	0	3	310	84	13	4	0	0	7	.223	.284	.298	.582	23	-10.9	.271	62	-13.3
14	Jim Essian J. Essian	278	1978	OAK	126	21	62	9	1	3	26	44	0	22	2	1	340	82	13	15	3	1	12	.223	.326	.295	.621	31	-6.2	.294	85	-5.9
15	Charlie Moore C. Moore	268	1978	MIL	96	30	72	7	1	5	31	12	0	24	4	2	285	96	13	5	0	0	4	.269	.300	.358	.658	27	-3.8	.300	86	-4.4
16	Jeff Newman J. Newman	268	1978	OAK	105	25	64	7	1	9	32	18	1	40	0	3	291	100	17	3	1	2	4	.239	.288	.373	.661	27	-4.2	.299	88	-3.9
17	Alan Ashby A. Ashby	264	1978	TOR	81	27	69	15	0	9	29	28	1	32	1	1	298	111	24	4	1	4	10	.261	.333	.420	.754	37	4.6	.338	107	2.2
18	Buck Martinez B. Martinez	256	1978	MIL	89	26	56	10	1	1	20	14	0	42	1	1	286	71	12	12	4	1	4	.219	.255	.277	.533	15	-16.1	.243	47	-16.8
19	Ron Pruitt R. Pruitt	187	1978	CLE	71	17	44	6	1	6	17	16	0	20	2	1	205	70	13	2	0	3	3	.235	.296	.374	.670	20	-2.7	.300	85	-3.4
20	Mike Colbern M. Colbern	141	1978	CWS	48	11	38	5	1	2	20	1	2	36	0	1	146	51	8	0	2	0	1	.270	.281	.362	.643	13	-3.2	.289	77	-3.7
21	Bo Diaz B. Diaz	127	1978	CLE	44	12	30	4	0	2	11	4	0	17	0	0	133	40	6	2	0	0	2	.236	.260	.315	.575	9	-5.6	.262	59	-6
22	Glenn Borgmann G. Borgmann	123	1978	MIN	49	16	26	4	1	3	15	18	0	17	0	0	147	41	8	3	3	0	0	.211	.306	.333	.639	14	-2.4	.296	80	-3.3
23	Terry Humphrey T. Humphrey	114	1978	CAL	53	11	25	4	1	1	9	6	2	12	0	1	127	34	6	2	3	0	2	.219	.264	.298	.562	8	-5.8	.257	60	-5.7
24	John Ellis J. Ellis	94	1978	TEX	34	7	23	4	0	3	17	6	0	20	0	1	104	36	7	1	3	0	0	.245	.282	.383	.665	10	-1.6	.297	83	-2
25	Bill Plummer B. Plummer	93	1978	SEA	41	6	20	5	0	2	7	12	0	19	0	0	106	31	7	1	0	0	3	.215	.305	.333	.638	10	-1.6	.298	81	-2.2