team with worst run differential in a single season from 1980 to 1990

Between the 1980 and 1990 seasons, the Baltimore Orioles had the lowest run differential by a team in a season, with a differential of -239 runs in 1988.

	TEAM	DIFF	SEASON	G	W%	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	Orioles	-239	1988	161	.335	54	107	5,358	550	1,275	199	20	137	517	504	32	869	69	44	5,979	1,925	356	40	45	31	140	.238	.305	.359	.664
2	Indians	-215	1987	162	.377	61	101	5,606	742	1,476	267	30	187	691	489	31	977	140	54	6,212	2,364	484	44	42	30	103	.263	.324	.422	.745
3	Tigers	-199	1989	162	.364	59	103	5,432	617	1,315	198	24	116	564	585	37	899	103	50	6,132	1,909	338	35	43	25	138	.242	.318	.351	.669
4	Braves	-186	1988	160	.338	54	106	5,440	555	1,319	228	28	96	527	432	21	848	95	69	6,013	1,891	352	74	46	59	136	.242	.298	.348	.646
5	Mariners	-183	1980	163	.364	59	103	5,489	610	1,359	211	35	104	564	483	19	727	116	62	6,141	1,952	350	106	44	44	136	.248	.308	.356	.664
6	Mariners	-182	1983	162	.370	60	102	5,336	558	1,280	247	31	111	536	460	24	840	144	80	5,905	1,922	389	40	45	31	113	.240	.301	.360	.661
7	Rangers	-168	1985	161	.385	62	99	5,361	617	1,359	213	41	129	578	530	33	819	130	76	6,003	2,041	383	34	45	30	136	.253	.322	.381	.703
8	Twins	-162	1982	162	.370	60	102	5,544	657	1,427	234	44	148	624	474	24	887	38	33	6,115	2,193	426	22	51	31	149	.257	.316	.396	.711
9	Rangers	-159	1982	162	.395	64	98	5,445	590	1,354	204	26	115	558	447	32	750	63	45	6,020	1,955	345	64	32	22	134	.249	.308	.359	.667
10	Orioles	-151	1987	162	.414	67	95	5,576	729	1,437	219	20	211	701	524	22	939	69	45	6,185	2,329	450	31	32	29	139	.258	.322	.418	.740
11	Braves	-149	1985	162	.407	66	96	5,526	632	1,359	213	28	126	598	553	22	849	72	52	6,207	2,006	367	65	41	56	154	.246	.315	.363	.678
12	Yankees	-146	1990	162	.414	67	95	5,483	603	1,322	208	19	147	561	427	53	1,027	119	45	6,036	2,009	374	37	36	41	114	.241	.300	.366	.667
13	Pirates	-140	1985	161	.354	57	104	5,436	568	1,340	251	28	80	535	514	14	842	110	60	6,099	1,887	359	91	44	64	131	.247	.311	.347	.658
14	Braves	-139	1990	162	.401	65	97	5,504	682	1,376	263	26	162	636	473	27	1,010	92	55	6,084	2,177	451	49	31	36	101	.250	.311	.396	.706
15	Blue Jays	-138	1980	162	.414	67	95	5,571	624	1,398	249	53	126	580	448	33	813	67	72	6,149	2,131	428	63	34	44	119	.251	.309	.383	.691
16	Phillies	-137	1988	162	.404	65	96	5,403	597	1,294	246	31	106	567	489	47	981	112	49	6,054	1,920	383	67	48	51	106	.239	.306	.355	.661
17	Blue Jays	-137	1981	106	.349	37	69	3,521	329	797	137	23	61	314	284	20	556	66	57	3,887	1,163	221	44	18	23	72	.226	.286	.330	.617
18	White Sox	-135	1980	162	.438	70	90	5,444	587	1,408	255	38	91	547	399	39	670	68	54	6,000	2,012	384	67	51	46	142	.259	.311	.370	.681
19	Indians	-132	1985	162	.370	60	102	5,527	729	1,465	254	31	116	689	492	15	817	132	72	6,120	2,129	401	38	48	26	139	.265	.324	.385	.709
20	Athletics	-128	1982	162	.420	68	94	5,448	691	1,286	211	27	149	659	582	20	948	232	87	6,154	1,998	387	50	54	20	95	.236	.309	.367	.676
21	White Sox	-126	1988	161	.441	71	90	5,449	631	1,327	224	35	132	573	446	34	908	98	46	6,039	2,017	391	67	43	50	118	.244	.303	.370	.673
22	Giants	-125	1984	162	.407	66	96	5,650	682	1,499	229	26	112	646	528	17	980	126	76	6,290	2,116	367	51	44	44	141	.265	.328	.375	.702
23	Reds	-120	1984	162	.432	70	92	5,498	627	1,342	238	30	106	578	566	12	978	160	63	6,200	1,958	374	71	53	62	99	.244	.313	.356	.669
24	Giants	-118	1985	162	.383	62	100	5,420	556	1,263	217	31	115	517	488	37	962	99	55	6,063	1,887	363	93	25	53	121	.233	.299	.348	.648
25	Mariners	-117	1986	162	.414	67	95	5,498	718	1,392	243	41	158	681	572	34	1,148	93	76	6,185	2,191	442	52	29	38	125	.253	.326	.399	.724