The Cleveland Cavaliers have the lowest net rating by a team in an NBA Finals, with a -16.1 rating.

worst net rating by a team in an nba finals

TEAM	NETRTG	SEASON	SERIES	GP	ORTG	DRTG	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
Cleveland Cavaliers	-16.1	2017-18	NBA Finals	4	108.5	124.6	246.3	101.0	46.5	21.0	6.3	4.0	11.3	37.8	92.0	41.0	9.0	30.5	29.5	16.5	22.5	73.3	985	404	186	84	25	16	45	73
Miami Heat	-16.0	2013-14	NBA Finals	5	104.8	120.8	240.0	91.6	32.2	15.2	8.0	2.2	14.4	33.6	71.2	47.2	9.2	23.2	39.7	15.2	20.6	73.8	1,200	458	161	76	40	11	72	115
Los Angeles Lakers	-11.2	1990-91	NBA Finals	5	104.5	115.7	245.0	91.6	35.6	19.2	6.8	4.4	15.0	33.4	74.8	44.7	2.6	9.2	28.3	22.2	27.4	81.0	1,225	458	178	96	34	22	75	96
Houston Rockets	-10.9	1980-81	NBA Finals	6	95.7	106.5	240.0	86.7	42.7	18.0	7.8	5.7	13.2	33.8	89.3	37.9	0.5	1.8	27.3	18.5	25.8	71.6	1,440	520	256	108	47	34	79	121
Los Angeles Lakers	-10.6	2003-04	NBA Finals	5	96.1	106.7	245.0	81.8	37.6	20.6	7.2	2.8	13.2	31.6	76.0	41.6	4.4	17.8	24.7	14.2	22.2	64.0	1,225	409	188	103	36	14	66	142
Orlando Magic	-10.4	2008-09	NBA Finals	5	100.5	110.8	250.0	91.2	38.2	18.4	6.0	6.0	14.0	32.2	75.2	42.8	7.6	23.0	33.0	19.2	27.8	69.1	1,250	456	191	92	30	30	70	110
New Jersey Nets	-10.2	2001-02	NBA Finals	4	106.5	116.6	240.0	96.8	39.0	21.5	9.5	4.5	11.3	38.8	88.8	43.7	4.5	14.8	30.5	14.8	22.0	67.0	960	387	156	86	38	18	45	105
Los Angeles Lakers	-9.9	1982-83	NBA Finals	4	99.7	109.6	240.0	100.5	42.8	24.5	9.0	7.3	20.0	40.8	90.3	45.2	0.8	3.8	20.0	18.3	23.3	78.5	960	402	171	98	36	29	80	120
Utah Jazz	-9.4	1997-98	NBA Finals	6	96.1	105.5	244.2	80.2	38.0	21.3	6.3	2.5	16.3	31.8	71.8	44.3	2.2	10.0	21.7	14.3	18.7	76.8	1,465	481	228	128	38	15	98	150
Los Angeles Lakers	-9.2	2007-08	NBA Finals	6	103.9	113.1	240.0	93.8	37.2	19.3	6.8	3.2	13.5	33.0	74.8	44.1	7.2	20.7	34.7	20.7	28.3	72.9	1,440	563	223	116	41	19	81	156
Miami Heat	-9.1	2022-23	NBA Finals	5	106.4	115.5	240.0	96.4	37.6	23.0	5.6	4.2	9.0	35.8	88.0	40.7	11.6	33.8	34.3	13.2	15.4	85.7	1,200	482	188	115	28	21	45	99
Portland Trail Blazers	-7.8	1991-92	NBA Finals	6	103.0	110.8	244.2	96.7	41.8	20.8	7.8	3.8	17.0	35.3	79.8	44.3	1.7	8.7	19.2	24.3	30.8	78.9	1,465	580	251	125	47	23	102	155
Cleveland Cavaliers	-7.6	2014-15	NBA Finals	6	99.6	107.3	248.3	93.5	47.5	15.8	7.5	5.0	12.2	32.7	85.2	38.4	8.2	27.8	29.3	20.0	28.5	70.2	1,490	561	285	95	45	30	73	133
Los Angeles Lakers	-7.5	1988-89	NBA Finals	4	113.1	120.6	240.0	102.3	36.3	23.0	5.5	4.0	11.8	36.0	77.5	46.5	3.3	10.8	30.2	27.0	36.0	75.0	960	409	145	92	22	16	47	104
Philadelphia 76ers	-7.4	2000-01	NBA Finals	5	102.6	110.0	245.0	93.8	42.8	18.4	7.8	4.8	12.4	35.4	83.4	42.4	3.4	11.8	28.8	19.6	27.4	71.5	1,225	469	214	92	39	24	62	125
Cleveland Cavaliers	-7.2	2006-07	NBA Finals	4	97.2	104.4	240.0	80.5	41.0	16.5	6.3	2.8	11.0	31.0	78.5	39.5	5.5	18.8	29.3	13.0	18.8	69.3	960	322	164	66	25	11	44	76
Orlando Magic	-7.2	1994-95	NBA Finals	4	109.9	117.1	246.3	107.0	46.0	27.5	5.3	5.0	16.0	40.8	87.5	46.6	10.3	29.5	34.7	15.3	22.3	68.5	985	428	184	110	21	20	64	97
Cleveland Cavaliers	-6.8	2016-17	NBA Finals	5	114.6	121.3	240.0	114.8	43.6	21.6	7.2	3.6	13.2	41.6	90.2	46.1	13.2	34.6	38.2	18.4	24.6	74.8	1,200	574	218	108	36	18	66	112
New Jersey Nets	-6.6	2002-03	NBA Finals	6	93.3	100.0	240.0	82.0	42.5	16.7	7.8	6.3	13.7	30.3	82.0	37.0	3.8	13.8	27.7	17.5	22.3	78.4	1,440	492	255	100	47	38	82	145
Houston Rockets	-6.4	1985-86	NBA Finals	6	105.5	111.9	240.0	102.0	45.5	27.2	9.0	6.7	14.3	41.8	92.8	45.1	0.8	2.8	29.4	17.5	24.7	70.9	1,440	612	273	163	54	40	86	133
Seattle SuperSonics	-6.2	1977-78	NBA Finals	7	97.3	103.5	243.6	98.9	50.0	17.3	5.7	7.0	18.0	38.4	91.6	42.0				22.0	29.9	73.7	1,705	692	350	121	40	49	126	193
Miami Heat	-5.9	2019-20	NBA Finals	6	112.2	118.1	240.0	104.5	37.5	24.3	5.5	3.2	11.0	36.7	79.5	46.1	11.5	31.5	36.5	19.7	23.5	83.7	1,440	627	225	146	33	19	66	119
Golden State Warriors	-5.9	2018-19	NBA Finals	6	110.1	116.0	240.0	105.8	40.3	28.2	6.8	4.8	15.5	36.7	81.8	44.8	12.7	33.5	37.8	19.8	24.8	79.9	1,440	635	242	169	41	29	93	142
New York Knicks	-5.8	1998-99	NBA Finals	5	93.1	98.9	240.0	79.8	38.2	14.0	8.0	3.4	11.6	30.8	78.6	39.2	2.2	10.8	20.4	16.0	21.0	76.2	1,200	399	191	70	40	17	58	123
Philadelphia 76ers	-5.6	1976-77	NBA Finals	6	92.9	98.5	240.0	105.0	44.8	22.7	11.8	5.0	22.0	39.5	88.2	44.8				26.0	36.5	71.2	1,440	630	269	136	71	30	132	174