The Pittsburgh Pirates had their best record against the NL West in a season in 2015, with a record of 27-6.

Interpreted as:

pirates record in a regular season record vs nl west

	TEAM	REC	SEASON	W%	G	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Pirates	27-6	2015	.818	33	27	6	1,157	164	329	61	8	29	157	101	17	254	24	11	1,296	493	98	9	12	10	20	.284	.347	.426	.773
2	Pirates	22-11	2016	.667	33	22	11	1,152	185	315	66	4	36	177	118	18	272	24	8	1,300	497	106	7	5	8	24	.273	.349	.431	.780
3	Pirates	46-26	1990	.639	72	46	26	2,422	350	653	125	18	69	335	284	7	397	70	23	2,787	1,021	212	43	31	38	61	.270	.344	.422	.766
4	Pirates	20-12	2014	.625	32	20	12	1,092	139	292	56	8	28	134	103	17	237	19	16	1,235	448	92	13	10	13	19	.267	.337	.410	.747
5	Pirates	44-28	1979	.611	72	44	28	2,477	346	672	120	25	70	319	216	11	379	75	25	2,776	1,052	215	45	27	43	55	.271	.329	.425	.754
6	Pirates	44-28	1974	.611	72	44	28	2,509	351	705	117	24	50	328	228	17	335	23	15	2,808	1,020	191	24	30	28	65	.281	.341	.407	.748
7	Pirates	43-29	1972	.597	72	43	29	2,640	338	751	130	23	55	324	178	12	411	23	10	2,884	1,092	208	31	23	31	54	.284	.330	.414	.743
8	Pirates	43-29	1971	.597	72	43	29	2,529	365	727	96	32	69	348	189	11	371	24	13	2,780	1,094	197	28	23	25	60	.287	.337	.433	.769
9	Pirates	42-30	1976	.583	72	42	30	2,460	320	665	117	23	55	292	185	12	362	60	18	2,699	993	195	23	19	28	66	.270	.322	.404	.726
10	Pirates	41-31	1977	.569	72	41	31	2,510	330	696	115	31	59	299	227	17	394	125	60	2,804	1,050	205	29	21	35	46	.277	.339	.418	.757
11	Pirates	40-32	1991	.556	72	40	32	2,406	323	618	106	16	63	306	258	9	402	56	18	2,732	945	185	36	23	27	48	.257	.328	.393	.721
12	Pirates	39-32	1978	.549	71	39	32	2,408	310	635	114	26	45	288	201	15	418	109	43	2,678	936	185	27	27	42	34	.264	.321	.389	.710
13	Pirates	39-32	1975	.549	71	39	32	2,399	298	636	120	26	60	282	179	15	316	28	12	2,651	988	206	35	23	25	48	.265	.317	.412	.729
14	Pirates	39-33	1987	.542	72	39	33	2,429	304	609	114	20	54	290	237	14	431	57	29	2,726	925	188	29	17	32	45	.251	.319	.381	.700
15	Pirates	39-33	1983	.542	72	39	33	2,412	274	620	97	12	62	256	219	9	403	56	30	2,690	927	171	32	18	21	53	.257	.319	.384	.703
16	Pirates	39-33	1969	.542	72	39	33	2,556	338	727	106	29	67	310	174	20	425	38	21	2,792	1,092	202	26	16	29	47	.284	.333	.427	.760
17	Pirates	16-14	2004	.533	30	16	14	1,048	143	280	49	15	39	138	93	14	199	12	10	1,183	476	103	22	6	9	20	.267	.333	.454	.788
18	Pirates	38-34	1982	.528	72	38	34	2,496	301	651	102	14	67	286	189	12	404	85	27	2,753	982	183	28	28	27	54	.261	.313	.393	.706
19	Pirates	16-15	2023	.516	31	16	15	1,045	162	275	54	6	33	157	111	16	264	23	16	1,191	440	93	8	11	0	15	.263	.340	.421	.761
20	Pirates	36-34	1988	.514	70	36	34	2,319	270	556	86	20	42	260	229	13	421	43	27	2,614	808	148	30	23	27	48	.240	.309	.348	.657
21	Pirates	22-21	1999	.512	43	22	21	1,454	212	386	79	14	57	205	164	15	315	33	18	1,668	664	150	22	13	11	30	.265	.343	.457	.800
22	Pirates	17-17	2019	.500	34	17	17	1,182	160	324	66	5	38	154	78	8	250	7	3	1,292	514	109	16	8	5	24	.274	.321	.435	.756
23	Pirates	22-22	1997	.500	44	22	22	1,510	220	405	91	15	41	207	147	18	305	37	15	1,706	649	147	20	11	10	22	.268	.338	.430	.768
24	Pirates	18-19	2005	.486	37	18	19	1,345	199	369	74	10	37	192	111	9	232	22	3	1,489	574	121	14	10	7	27	.274	.332	.427	.758
25	Pirates	35-37	1992	.486	72	35	37	2,454	323	650	140	22	48	311	262	7	415	56	28	2,793	978	210	43	27	40	45	.265	.334	.399	.733