the highest +/- this season for player averaging less than 18 mpg

I don't have anything for this season, but Kenrich Williams had the highest plus/minus with fewer than 18.0 minutes per game in 2024-25, at +329.

	NAME	+/-	MPG	SEASON	TM	GP	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF
1	Kenrich Williams K. Williams	+329	16.4	2024-25	OKC	69	6.3	3.5	1.4	0.6	0.1	2.5	5.1	48.3	1.0	2.5	38.6	0.4	0.6	71.8	58.7	0.9	2.6	0.6	1,132	436	241	97	43	10	39	110
2	Jaylin Williams J. Williams	+302	16.7	2024-25	OKC	47	5.9	5.6	2.6	0.5	0.6	2.1	4.7	43.9	1.3	3.3	39.9	0.5	0.6	76.7	59.4	1.0	4.6	0.7	784	278	262	120	22	29	35	79
3	Cameron Payne C. Payne	+204	15.1	2024-25	NYK	72	6.9	1.4	2.8	0.5	0.2	2.5	6.2	40.1	1.3	3.6	36.3	0.7	0.8	90.7	53.2	0.2	1.3	0.7	1,090	500	104	203	39	16	52	111
4	Steven Adams S. Adams	+172	13.7	2024-25	HOU	58	3.9	5.6	1.1	0.4	0.5	1.6	2.9	54.5	0.0	0.0	0.0	0.7	1.6	46.2	54.1	2.9	2.8	0.9	794	225	327	66	22	28	54	60
5	Gui Santos G. Santos	+165	13.6	2024-25	GSW	56	4.1	3.1	1.4	0.4	0.2	1.5	3.2	45.8	0.6	1.8	33.0	0.5	0.8	69.0	57.5	1.3	1.8	0.8	762	227	172	80	25	10	42	91
6	Neemias Queta N. Queta	+155	13.9	2024-25	BOS	62	5.0	3.8	0.7	0.3	0.7	2.1	3.3	65.0	0.0	0.0	0.0	0.7	1.0	75.4	67.4	1.4	2.4	0.6	863	310	236	45	18	42	40	106
7	Nicolas Batum N. Batum	+152	17.5	2024-25	LAC	78	4.0	2.8	1.1	0.7	0.5	1.3	3.1	43.7	1.1	2.6	43.3	0.2	0.3	81.0	63.3	0.6	2.2	0.4	1,367	313	218	84	52	36	34	111
8	Ajay Mitchell A. Mitchell	+127	16.6	2024-25	OKC	36	6.5	1.9	1.8	0.7	0.1	2.5	5.1	49.5	0.6	1.7	38.3	0.8	1.0	82.9	58.7	0.5	1.4	0.8	597	234	68	64	25	4	29	68
9	Kevon Looney K. Looney	+119	15.0	2024-25	GSW	76	4.5	6.1	1.6	0.6	0.5	1.9	3.7	51.4	0.0	0.1	40.0	0.7	1.3	56.6	53.5	2.4	3.6	0.5	1,142	344	462	118	46	37	39	154
10	Alec Burks A. Burks	+110	17.6	2024-25	MIA	49	7.3	2.5	1.1	0.6	0.1	2.3	5.5	42.4	1.8	4.2	42.5	0.8	1.0	77.6	60.8	0.3	2.2	0.6	863	356	124	55	28	7	29	37
11	Aaron Holiday A. Holiday	+88	12.8	2024-25	HOU	62	5.5	1.3	1.3	0.3	0.2	1.9	4.3	43.7	1.2	2.9	39.8	0.5	0.7	82.9	59.4	0.2	1.0	0.6	792	340	78	83	19	11	37	64
12	Landry Shamet L. Shamet	+88	15.2	2024-25	NYK	50	5.7	1.2	0.5	0.5	0.0	2.1	4.6	46.1	1.2	3.1	39.7	0.2	0.4	66.7	60.1	0.2	1.0	0.4	762	286	61	27	23	2	22	52
13	Mouhamed Gueye M. Gueye	+87	16.2	2024-25	ATL	33	6.0	4.2	0.8	0.8	1.0	2.2	5.2	42.1	0.6	2.5	25.9	1.0	1.3	76.2	52.0	1.3	2.9	0.5	533	197	139	27	28	33	15	55
14	Gary Harris G. Harris	+85	14.8	2024-25	ORL	48	3.0	1.3	0.6	0.5	0.3	1.1	2.8	38.3	0.8	2.1	35.6	0.1	0.3	58.3	52.4	0.4	0.9	0.4	711	145	64	30	26	12	17	45
15	Ryan Rollins R. Rollins	+83	14.6	2024-25	MIL	56	6.2	1.9	1.9	0.8	0.3	2.4	4.8	48.7	0.9	2.1	40.8	0.6	0.8	80.0	60.0	0.4	1.6	0.9	820	349	108	104	42	17	53	88
16	Dillon Jones D. Jones	+75	10.2	2024-25	OKC	54	2.5	2.2	1.1	0.3	0.1	0.9	2.5	38.3	0.3	1.2	25.4	0.3	0.5	60.7	46.4	0.6	1.7	0.5	551	135	121	58	16	4	28	54
17	Lamar Stevens L. Stevens	+67	9.1	2024-25	MEM	17	4.4	2.2	0.5	0.3	0.2	1.7	3.7	46.0	0.5	1.6	29.6	0.5	0.6	72.7	54.5	0.2	2.0	0.6	155	74	38	8	5	3	10	15
18	Jared Rhoden J. Rhoden	+64	16.2	2024-25	TOT	14	8.4	3.0	1.1	0.7	0.1	3.0	6.2	48.3	0.9	2.8	30.8	1.6	1.8	88.0	60.2	1.0	2.0	0.6	227	118	42	16	10	2	9	20
19	John Konchar J. Konchar	+58	12.1	2024-25	MEM	46	2.4	3.3	0.9	0.7	0.3	0.9	2.0	45.1	0.5	1.3	37.1	0.2	0.2	87.5	59.2	0.8	2.5	0.3	558	112	151	42	30	14	16	32
20	Jordan McLaughlin J. McLaughlin	+57	6.8	2024-25	TOT	46	2.1	0.7	1.1	0.3	0.0	0.7	1.6	43.1	0.4	1.0	41.3	0.4	0.5	77.3	60.0	0.1	0.5	0.3	314	98	30	51	16	1	16	18
21	Mason Plumlee M. Plumlee	+54	17.6	2024-25	PHX	74	4.5	6.1	1.8	0.4	0.6	1.7	2.7	61.9	0.0	0.1	0.0	1.1	1.7	64.8	64.5	1.6	4.6	0.8	1,300	333	455	134	33	47	59	154
22	Cole Swider C. Swider	+54	16.9	2024-25	TOT	10	5.9	2.7	0.3	0.4	0.2	2.2	6.3	34.9	1.5	4.7	31.9	0.0	0.1	0.0	46.5	0.5	2.2	0.4	169	59	27	3	4	2	4	12
23	Jalen Pickett J. Pickett	+52	13.6	2024-25	DEN	49	4.1	1.4	2.2	0.4	0.1	1.6	3.7	42.8	0.8	2.1	39.6	0.1	0.2	75.0	54.5	0.3	1.1	0.5	666	200	71	107	19	5	24	38
24	Jae'Sean Tate J. Tate	+51	11.3	2024-25	HOU	52	3.6	2.3	0.9	0.5	0.1	1.3	2.8	47.3	0.3	0.9	34.8	0.6	0.9	68.1	55.7	1.0	1.3	0.4	588	188	117	47	26	7	22	82
25	Monté Morris M. Morris	+47	12.7	2024-25	PHX	45	5.2	1.5	1.6	0.4	0.1	1.8	4.3	42.6	0.7	1.9	36.0	0.8	0.9	85.7	54.6	0.3	1.2	0.5	571	233	67	73	20	3	21	23