Since 1990, Frank Thomas has the highest OPS by a first baseman, with an OPS of 1.061.

Interpreted as:

highest ops with a minimum of 1.55 PA per team game for a 1b since 1990

	NAME	OPS	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	Frank Thomas F. Thomas	1.061	918	3,262	681	1,083	215	6	225	745	741	25	470	17	13	4,089	1,985	446	0	61	105	103	.332	.452	.609	897	403.1	.449	177	396
2	Mark McGwire M. McGwire	1.022	1,407	4,537	899	1,199	184	1	466	1,093	1,083	62	1,236	10	5	5,739	2,783	651	2	55	133	103	.264	.409	.613	1171	474.2	.428	163	465.7
3	Jim Thome J. Thome	.984	1,238	4,272	836	1,190	229	12	337	909	947	32	1,338	4	9	5,292	2,454	578	0	41	107	64	.279	.410	.574	1026	365.8	.414	150	336.9
4	Jack Clark J. Clark	.974	115	334	59	89	12	1	25	62	104	2	91	4	3	442	178	38	0	2	11	12	.266	.441	.533	86	37	.427	167	34.4
5	Todd Helton T. Helton	.955	2,212	7,869	1,388	2,493	590	36	364	1,395	1,327	57	1,164	37	28	9,349	4,247	990	3	93	185	185	.317	.415	.540	1750	610.4	.406	132	390.6
6	Jeff Bagwell J. Bagwell	.948	2,150	7,797	1,517	2,314	488	32	449	1,529	1,401	128	1,558	202	78	9,431	4,213	969	3	102	155	221	.297	.408	.540	1755	596.6	.405	149	588.3
7	Carlos Delgado C. Delgado	.944	1,815	6,573	1,149	1,863	450	16	436	1,385	1,019	160	1,534	13	7	7,834	3,653	902	0	82	180	133	.283	.388	.556	1402	429.9	.396	139	394.7
8	Jason Giambi J. Giambi	.939	1,745	5,626	987	1,598	314	7	352	1,147	1,101	142	1,212	15	9	6,942	2,982	673	1	72	78	129	.284	.409	.530	1284	425.9	.403	145	401.8
9	Mike Brosseau M. Brosseau	.936	36	86	12	26	5	1	5	12	8	3	31	2	0	98	48	11	0	1	0	1	.302	.378	.558	18	6.2	.394	158	7
10	Miguel Cabrera M. Cabrera	.933	1,235	4,585	727	1,436	307	6	239	836	609	27	869	14	9	5,266	2,472	552	0	45	124	166	.313	.393	.539	929	318.6	.395	147	294.1
11	Albert Pujols A. Pujols	.931	2,096	7,766	1,332	2,307	479	9	494	1,485	999	76	899	100	32	8,925	4,286	982	0	84	265	291	.297	.379	.552	1554	497.4	.389	144	489.6
12	Lance Berkman L. Berkman	.928	886	3,064	513	882	194	10	173	571	570	26	613	44	16	3,684	1,615	377	0	24	87	87	.288	.401	.527	650	204.7	.394	141	190.9
13	Joey Votto J. Votto	.920	2,056	7,252	1,171	2,135	459	22	356	1,144	1,365	81	1,640	80	29	8,746	3,706	837	0	48	147	168	.294	.409	.511	1563	539.6	.394	145	472.9
14	Jeremy Giambi J. Giambi	.919	124	313	58	81	17	0	20	45	79	4	94	0	1	397	158	37	1	0	2	5	.259	.414	.505	73	24.8	.401	149	24.2
15	Mike Sweeney M. Sweeney	.919	688	2,634	440	839	174	3	126	510	283	39	269	36	16	2,989	1,397	303	1	32	37	65	.319	.389	.530	525	147.2	.391	130	115.9
16	Adam Dunn A. Dunn	.910	317	1,104	166	291	65	2	76	208	193	13	376	0	2	1,316	588	143	0	6	26	18	.264	.378	.533	222	67.8	.388	139	62.4
17	Prince Fielder P. Fielder	.910	1,364	4,882	755	1,389	277	10	288	886	751	106	1,004	18	11	5,790	2,550	575	0	51	149	125	.285	.388	.522	977	298.5	.386	139	272.2
18	David Justice D. Justice	.908	127	439	76	124	23	2	28	78	64	0	92	11	6	504	235	53	0	1	4	2	.282	.373	.535	88	31.5	.400	145	26.3
19	Mo Vaughn M. Vaughn	.906	1,512	5,532	861	1,620	270	10	328	1,064	725	108	1,429	30	18	6,410	2,894	608	0	45	144	136	.293	.383	.523	1090	296	.387	129	246.2
20	Kevin Youkilis K. Youkilis	.903	675	2,488	452	740	182	14	104	426	365	62	525	23	12	2,949	1,262	300	0	34	16	45	.297	.396	.507	510	152.1	.391	135	128.7
21	Freddie Freeman F. Freeman	.902	2,063	7,670	1,320	2,308	518	32	352	1,265	1,024	108	1,656	98	31	8,866	3,946	902	0	64	137	162	.301	.388	.514	1529	494.2	.383	143	461.1
22	Kevin Maas K. Maas	.902	79	254	42	64	9	0	21	41	43	3	76	1	2	300	136	30	0	0	10	2	.252	.367	.535	50	16.4	.390	145	15.4
23	George Brett G. Brett	.902	142	544	82	179	45	7	14	87	56	0	63	9	2	607	280	66	0	7	14	18	.329	.387	.515	102	34.1	.392	147	32.7
24	Edwin Encarnacion E. Encarnacion	.895	379	1,425	246	374	74	3	104	288	202	13	247	9	2	1,649	766	181	0	9	14	42	.262	.357	.538	274	86.6	.381	143	80.9
25	Rafael Palmeiro R. Palmeiro	.895	2,105	7,913	1,283	2,280	451	25	451	1,416	1,047	68	1,088	74	28	9,135	4,134	927	11	96	139	175	.288	.372	.522	1517	408.8	.383	132	362.3