First basemen had their highest OPS in a season in 1929, with an OPS of .872.

Interpreted as:

leading first basemen ops in a regular season

	POSITION	OPS	SEASON	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	WRC	WRAA	WOBA	WRC+	BRAA
1	First Baseman	.872	1929	2,718	9,667	1,549	3,037	595	153	253	1,739	1,102	39	736	138		11,101	4,697	1,001	293				.314	.387	.486	1860	391.5	.395	119	288.7
2	First Baseman	.872	1930	2,900	10,147	1,772	3,211	608	161	271	1,840	1,067	45	869	157		11,567	4,954	1,040	308				.316	.384	.488	1968	339.3	.389	114	238.2
3	First Baseman	.869	2000	6,069	18,633	2,873	5,268	1,110	52	919	3,389	2,586	234	3,668	106	65	21,672	9,239	2,081	19	200	231	481	.283	.374	.496	3465	619.2	.373	117	512.5
4	First Baseman	.867	1934	2,512	9,288	1,513	2,832	540	116	314	1,669	1,051	30	815	78		10,464	4,546	970	95				.305	.377	.489	1751	437.2	.393	124	342.7
5	First Baseman	.860	1936	2,723	10,138	1,701	3,148	567	145	279	1,747	1,125	53	811	95		11,400	4,842	991	84				.311	.382	.478	1905	409.7	.393	118	293
6	First Baseman	.860	1938	2,557	9,177	1,518	2,714	499	129	310	1,539	1,215	36	864	72		10,515	4,401	938	87				.296	.380	.480	1738	418	.393	122	316.8
7	First Baseman	.852	1997	5,265	17,276	2,649	4,861	961	48	834	3,010	2,228	163	3,521	196	97	19,904	8,420	1,843	31	206	233	400	.281	.365	.487	3046	595.5	.368	120	511.9
8	First Baseman	.849	1999	6,179	19,674	3,032	5,541	1,126	88	879	3,367	2,567	193	3,719	169	99	22,648	9,480	2,093	23	191	214	522	.282	.367	.482	3464	515	.367	113	410.4
9	First Baseman	.847	1925	2,730	9,414	1,421	2,984	544	156	180	1,522	919	59	618	137		10,639	4,380	880	247				.317	.381	.465	1691	298.1	.388	114	211.5
10	First Baseman	.845	1939	2,597	9,299	1,469	2,801	518	118	272	1,484	1,061	35	825	86		10,599	4,371	908	204			200	.301	.375	.470	1675	362.5	.386	120	272.4
11	First Baseman	.845	1996	5,632	18,811	2,856	5,420	1,040	63	800	3,162	2,270	176	3,412	205	114	21,478	8,986	1,903	41	180	244	501	.288	.367	.478	3314	547.5	.365	116	457.5
12	First Baseman	.844	2001	6,045	18,839	2,780	5,169	1,095	63	897	3,223	2,466	215	3,911	138	85	21,724	9,081	2,055	19	185	278	476	.274	.362	.482	3288	592	.359	118	491.2
13	First Baseman	.841	2006	6,236	19,545	2,891	5,491	1,158	69	880	3,217	2,240	236	3,888	120	62	22,247	9,427	2,107	30	196	261	548	.281	.359	.482	3305	512.9	.358	114	414
14	First Baseman	.840	1994	3,670	11,745	1,749	3,369	660	43	502	1,961	1,361	84	2,094	112	60	13,351	5,621	1,205	28	133	181	291	.287	.361	.479	2008	317.6	.361	115	264
15	First Baseman	.835	2009	6,177	19,907	2,861	5,425	1,184	66	914	3,282	2,565	207	4,121	103	60	22,887	9,483	2,164	26	182	314	502	.273	.359	.476	3331	588.7	.360	117	490
16	First Baseman	.834	1995	5,123	16,198	2,449	4,582	904	57	689	2,706	1,911	145	2,806	135	90	18,460	7,667	1,650	46	160	225	420	.283	.360	.473	2753	448.7	.362	116	371.3
17	First Baseman	.833	1937	2,726	9,610	1,531	2,833	511	132	275	1,548	1,145	39	906	93		10,904	4,433	918	110				.295	.372	.461	1698	329.1	.381	115	224.3
18	First Baseman	.833	1961	3,900	11,589	1,649	3,198	528	99	543	1,954	1,380	84	1,912	67	62	13,209	5,553	1,170	46	110	129	307	.276	.354	.479	1987	426.7	.364	118	306.7
19	First Baseman	.832	1998	6,257	20,118	2,984	5,653	1,159	56	865	3,400	2,372	199	3,933	188	112	22,921	9,519	2,080	24	208	213	509	.281	.359	.473	3400	562.4	.360	116	460.3
20	First Baseman	.832	1928	2,664	9,106	1,464	2,725	533	157	208	1,411	995	45	732	134		10,465	4,196	898	319				.299	.371	.461	1586	310.3	.381	116	225.2
21	First Baseman	.829	1987	5,078	16,674	2,457	4,625	851	72	757	2,775	2,035	84	2,715	215	142	19,005	7,891	1,680	45	167	256	344	.277	.356	.473	2814	480.2	.356	117	398.4
22	First Baseman	.828	2004	5,964	19,205	2,820	5,262	1,138	47	844	3,063	2,367	247	3,659	121	53	22,024	9,026	2,029	30	175	242	499	.274	.358	.470	3200	469.4	.355	113	365.6
23	First Baseman	.826	1894	1,559	6,263	1,230	1,958	353	148	67	1,253	570	88	302	326		7,042	2,808	568	121				.313	.378	.448	1293	19.6	.382	97	-38.6
24	First Baseman	.825	2017	5,593	18,194	2,671	4,766	1,002	67	942	2,885	2,201	192	4,630	127	53	20,730	8,728	2,011	4	139	182	464	.262	.345	.480	3011	483.7	.348	115	395
25	First Baseman	.825	1931	2,674	9,513	1,471	2,879	556	156	177	1,551	1,079	29	802	118		10,738	4,278	889	117				.303	.375	.450	1675	346.6	.380	118	260.5