I don't have anything for this season, but Luka Dončić had the highest usage percentage for the Lakers versus the Mavericks in 2024-25, at 34.2 percent.

Interpreted as:

most usage by a player on lakers vs mavs this regular season

	NAME	USG%	SEASON	TM	GP	MPG	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	Luka Dončić L. Dončić	34.2	2024-25	LAL	2	36.7	32.0	11.5	9.0	3.5	1.0	11.0	22.5	48.9	4.0	8.5	47.1	6.0	8.5	70.6	61.0	1.5	10.0	2.5	73	64	23	18	7	2	5	6	+34
2	Anthony Davis A. Davis	34.1	2024-25	LAL	1	35.3	21.0	12.0	3.0	0.0	2.0	7.0	18.0	38.9	0.0	2.0	0.0	7.0	9.0	77.8	47.8	2.0	10.0	2.0	35	21	12	3	0	2	2	1	-19
3	LeBron James L. James	27.9	2024-25	LAL	3	36.1	24.0	9.7	4.7	1.0	0.0	9.3	16.3	57.1	1.0	4.0	25.0	4.3	5.3	81.3	64.2	1.7	8.0	3.3	108	72	29	14	3	0	10	4	+1
4	Dalton Knecht D. Knecht	26.3	2024-25	LAL	3	9.2	6.7	0.0	0.0	0.0	0.3	2.7	4.7	57.1	1.0	3.0	33.3	0.3	0.7	50.0	67.2	0.0	0.0	0.3	28	20	0	0	0	1	1	1	-9
5	Austin Reaves A. Reaves	19.1	2024-25	LAL	3	36.1	15.3	3.0	3.3	1.3	0.0	4.7	12.0	38.9	2.7	8.0	33.3	3.3	4.0	83.3	55.7	0.7	2.3	1.3	108	46	9	10	4	0	4	6	+10
6	Max Christie M. Christie	18.9	2024-25	LAL	1	30.4	12.0	1.0	3.0	1.0	1.0	5.0	9.0	55.6	1.0	4.0	25.0	1.0	1.0	100.0	63.6	1.0	0.0	2.0	30	12	1	3	1	1	2	2	-22
7	Jordan Goodwin J. Goodwin	17.7	2024-25	LAL	2	7.3	0.5	2.0	0.0	1.0	0.5	0.0	1.5	0.0	0.0	1.0	0.0	0.5	1.0	50.0	12.9	1.0	1.0	1.0	15	1	4	0	2	1	2	1	-4
8	Jarred Vanderbilt J. Vanderbilt	14.6	2024-25	LAL	2	13.5	5.0	4.0	1.5	1.0	0.0	2.0	4.5	44.4	1.0	1.5	66.7	0.0	0.0		55.6	1.5	2.5	0.0	27	10	8	3	2	0	0	3	-10
9	Rui Hachimura R. Hachimura	14.2	2024-25	LAL	3	33.9	12.0	3.0	1.3	0.7	0.7	4.7	9.0	51.9	1.7	5.0	33.3	1.0	1.3	75.0	62.6	0.7	2.3	1.0	102	36	9	4	2	2	3	5	+32
10	Jaxson Hayes J. Hayes	12.8	2024-25	LAL	3	14.0	4.0	5.3	0.3	1.0	1.3	1.7	3.0	55.6	0.0	0.0		0.7	1.3	50.0	55.8	1.7	3.7	0.3	42	12	16	1	3	4	1	9	-6
11	Gabe Vincent G. Vincent	12.7	2024-25	LAL	3	19.1	1.3	0.7	0.7	0.3	0.0	0.7	5.0	13.3	0.0	3.3	0.0	0.0	0.0		13.3	0.0	0.7	0.3	57	4	2	2	1	0	1	2	-23
12	Dorian Finney-Smith D. Finney-Smith	10.6	2024-25	LAL	3	29.9	6.0	5.3	2.3	1.0	0.3	2.0	6.0	33.3	1.3	4.3	30.8	0.7	0.7	100.0	47.7	2.7	2.7	0.7	90	18	16	7	3	1	2	1	+31