Donovan Mitchell had the highest usage percentage in the 2020 playoffs, at 37.4 percent.

Interpreted as:

highest usage rate by a player 2020 NBA playoffs

NAME	USG%	SEASON	TM	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
Donovan Mitchell	37.4	2019-20	UTA	7	37.7	36.3	5.0	4.9	1.0	0.3	4.1	11.9	22.4	52.9	4.7	9.1	51.6	7.9	8.3	94.8	264	254	35	34	7	2	29	11	+38
Luka Doncic	37.3	2019-20	DAL	6	35.8	31.0	9.8	8.7	1.2	0.5	5.2	10.7	21.3	50.0	2.7	7.3	36.4	7.0	10.7	65.6	215	186	59	52	7	3	31	17	-38
Giannis Antetokounmpo	35.0	2019-20	MIL	9	30.8	26.7	13.8	5.7	0.7	0.9	3.3	10.0	17.9	55.9	1.4	4.4	32.5	5.2	9.0	58.0	277	240	124	51	6	8	30	31	+27
Joel Embiid	34.3	2019-20	PHI	4	36.3	30.0	12.3	1.3	1.5	1.3	3.8	8.5	18.5	45.9	1.0	4.0	25.0	12.0	14.8	81.4	145	120	49	5	6	5	15	18	-53
Chris Clemons	32.7	2019-20	HOU	2	4.0	3.5	1.0	0.0	0.0	0.0	0.0	1.0	2.5	40.0	1.0	2.5	40.0	0.5	1.0	50.0	8	7	2	0	0	0	0	0	+11
James Harden	32.2	2019-20	HOU	12	37.3	29.6	5.6	7.7	1.5	0.8	3.8	9.1	19.0	47.8	3.3	9.8	33.3	8.2	9.7	84.5	448	355	67	92	18	10	45	43	+32
Russell Westbrook	31.5	2019-20	HOU	8	32.8	17.9	7.0	4.6	1.5	0.3	3.8	7.4	17.5	42.1	1.0	4.1	24.2	2.1	4.0	53.1	262	143	56	37	12	2	30	23	-37
Bol Bol	31.1	2019-20	DEN	4	5.3	4.8	1.3	0.0	0.5	0.5	0.5	1.3	2.3	55.6	0.5	0.8	66.7	1.8	2.0	87.5	21	19	5	0	2	2	2	1	+20
Talen Horton-Tucker	31.0	2019-20	LAL	2	8.5	7.0	2.5	0.0	1.0	0.0	0.0	3.0	6.0	50.0	1.0	2.5	40.0	0.0	0.0		17	14	5	0	2	0	0	4	+5
LeBron James	30.3	2019-20	LAL	21	36.3	27.6	10.8	8.8	1.2	0.9	4.0	10.2	18.2	56.0	2.1	5.7	37.0	5.1	7.1	72.0	762	580	226	184	26	18	84	40	+165
Nikola Vucevic	29.9	2019-20	ORL	5	37.0	28.0	11.0	4.0	0.8	0.6	2.6	11.2	22.2	50.5	3.6	8.8	40.9	2.0	2.2	90.9	185	140	55	20	4	3	13	13	-48
Kawhi Leonard	29.3	2019-20	LAC	13	39.3	28.2	9.3	5.5	2.3	0.8	2.5	10.1	20.6	48.9	1.8	5.6	32.9	6.2	7.2	86.2	511	367	121	72	30	11	33	29	+25
Nikola Jokic	28.9	2019-20	DEN	19	36.5	24.4	9.8	5.7	1.1	0.8	3.3	9.4	18.1	51.9	2.2	5.2	42.9	3.5	4.2	83.5	694	464	187	109	20	15	62	68	-14
Victor Oladipo	28.8	2019-20	IND	4	30.8	17.8	3.3	2.5	2.3	0.0	3.5	5.5	14.0	39.3	3.0	8.3	36.4	3.8	4.0	93.8	123	71	13	10	9	0	14	14	-12
Caris LeVert	28.5	2019-20	BKN	4	35.0	20.3	6.0	9.5	1.3	0.3	3.3	6.8	18.3	37.0	2.3	5.3	42.9	4.5	6.3	72.0	140	81	24	38	5	1	13	7	-52
Khris Middleton	28.4	2019-20	MIL	10	35.5	20.3	6.9	6.0	1.1	0.2	3.4	7.1	18.0	39.4	2.3	6.5	35.4	3.8	4.6	82.6	355	203	69	60	11	2	34	41	+58
Jayson Tatum	28.1	2019-20	BOS	17	40.6	25.7	10.0	5.0	1.0	1.2	2.8	8.5	19.6	43.4	2.8	7.4	37.3	5.9	7.2	81.3	690	437	170	85	17	20	48	41	+92
J.J. Barea	27.8	2019-20	DAL	1	5.0	3.0	0.0	0.0	0.0	0.0	1.0	0.0	1.0	0.0	0.0	0.0		3.0	3.0	100.0	5	3	0	0	0	0	1	1	-10
Anthony Davis	27.6	2019-20	LAL	21	36.6	27.7	9.7	3.5	1.2	1.4	2.5	9.8	17.1	57.1	1.1	2.9	38.3	7.1	8.5	83.2	769	582	204	73	26	30	53	56	+184
Jamal Murray	27.6	2019-20	DEN	19	39.6	26.5	4.8	6.6	0.9	0.3	2.8	9.8	19.4	50.5	3.3	7.2	45.3	3.7	4.1	89.7	753	504	92	126	18	6	53	42	+9
Stanley Johnson	27.6	2019-20	TOR	3	6.7	4.3	1.3	2.0	0.0	0.0	0.3	1.7	3.7	45.5	0.7	1.7	40.0	0.3	0.3	100.0	20	13	4	6	0	0	1	3	-5
Hamidou Diallo	27.5	2019-20	OKC	3	8.3	4.3	2.0	0.3	0.0	0.7	0.7	1.3	3.7	36.4	0.3	1.7	20.0	1.3	2.3	57.1	25	13	6	1	0	2	2	0	-23
Goran Dragic	27.5	2019-20	MIA	17	32.5	19.1	4.1	4.4	1.0	0.1	2.3	7.0	15.8	44.4	2.2	6.3	34.6	2.9	3.6	80.3	553	324	69	75	17	2	39	50	+79
Tacko Fall	27.0	2019-20	BOS	2	1.5	1.5	0.5	0.0	0.0	0.0	0.0	0.5	0.5	100.0	0.0	0.0		0.5	1.0	50.0	3	3	1	0	0	0	0	0	-2
Damian Lillard	26.8	2019-20	POR	4	35.8	24.3	3.5	4.3	0.5	0.3	3.5	6.5	16.0	40.6	3.3	8.3	39.4	8.0	8.3	97.0	143	97	14	17	2	1	14	4	-43