Jayson Tatum has scored the most career points by a player younger than 21 in the playoffs, with 351 points.

Interpreted as:

most playoff points before turning 21 years old by a player

	NAME	PTS	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	REB	AST	STL	BLK	TOV	PF	+/-
1	Jayson Tatum J. Tatum	351	19	35.9	18.5	4.4	2.7	1.2	0.5	6.5	13.7	47.1	1.2	3.7	32.4	4.3	5.1	84.5	57.8	0.5	3.8	2.2	683	83	52	23	10	41	50	+51
2	Tyler Herro T. Herro	335	21	33.6	16.0	5.1	3.7	0.4	0.1	5.7	13.2	43.3	2.3	6.1	37.5	2.2	2.6	87.0	55.7	0.3	4.8	2.0	706	107	77	8	2	42	31	+1
3	Kobe Bryant K. Bryant	328	28	23.9	11.7	3.1	2.3	0.8	0.7	4.0	9.8	41.4	0.6	2.1	28.3	3.0	3.9	77.3	51.0	0.8	2.4	2.0	668	87	64	21	20	56	75	-32
4	Tony Parker T. Parker	325	22	33.8	14.8	2.6	3.5	1.0	0.1	5.8	13.5	42.6	0.7	2.4	28.3	2.5	3.5	72.7	49.0	0.4	2.2	2.0	744	58	76	23	2	45	48	+54
5	Magic Johnson M. Johnson	293	16	41.1	18.3	10.5	9.4	3.1	0.4	6.4	12.4	51.8	0.1	0.5	25.0	5.3	6.6	80.2	59.6	3.3	7.3	4.1	658	168	151	49	6	65	47
6	Bradley Beal B. Beal	211	11	41.6	19.2	5.0	4.5	1.6	0.6	6.8	16.1	42.4	2.0	4.8	41.5	3.5	4.5	79.6	53.1	1.4	3.6	2.1	458	55	50	18	7	23	31	+24
7	Harrison Barnes H. Barnes	193	12	38.4	16.1	6.4	1.3	0.6	0.4	6.0	13.5	44.4	1.6	4.3	36.5	2.5	2.9	85.7	54.4	1.5	4.9	1.3	461	77	15	7	5	16	33	+18
8	Dereck Lively II D. Lively II	165	21	22.0	7.9	7.4	1.3	0.4	1.0	3.0	4.5	67.4	0.0	0.0	100.0	1.7	2.9	59.0	67.7	2.7	4.7	1.0	462	156	27	9	20	21	48	+98
9	Carmelo Anthony C. Anthony	156	9	35.9	17.3	6.7	2.3	0.9	0.1	6.2	16.3	38.1	0.2	1.3	16.7	4.7	5.8	80.8	45.9	2.3	4.3	3.3	323	60	21	8	1	30	31	-63
10	Anthony Edwards A. Edwards	151	6	37.8	25.2	4.2	3.0	1.2	1.2	8.3	18.3	45.5	3.8	9.5	40.4	4.7	5.7	82.4	60.4	0.7	3.5	2.5	227	25	18	7	7	15	22	-22
11	Derrick Rose D. Rose	138	7	44.8	19.7	6.3	6.4	0.6	0.7	8.4	17.1	49.2	0.0	0.6	0.0	2.9	3.6	80.0	52.7	1.7	4.6	5.0	313	44	45	4	5	35	25	-31
12	Thaddeus Young T. Young	133	12	32.5	11.1	4.5	1.0	1.1	0.1	4.6	10.0	45.8	0.5	1.4	35.3	1.4	1.7	85.0	51.6	2.0	2.5	1.0	390	54	12	13	1	12	24	-97
13	Brandon Jennings B. Jennings	131	7	35.6	18.7	3.0	3.6	1.1	0.6	7.0	17.1	40.8	1.7	5.9	29.3	3.0	3.7	80.8	49.8	0.7	2.3	1.1	249	21	25	8	4	8	19	-14
14	Darryl Dawkins D. Dawkins	131	18	18.4	7.3	5.4	0.9			2.8	5.3	52.6				1.7	2.6	66.0	56.6				331	98	17				46
15	Kawhi Leonard K. Leonard	121	14	27.1	8.6	5.9	0.6	1.2	0.4	3.2	6.4	50.0	1.3	2.9	45.0	0.9	1.1	81.3	62.3	1.3	4.6	0.9	379	83	8	17	6	13	23	+33
16	Jonathan Kuminga J. Kuminga	117	26	7.7	4.5	1.4	0.5	0.2	0.1	1.7	3.2	51.2	0.2	0.8	30.0	1.0	1.3	71.4	58.9	0.3	1.1	0.6	199	36	13	5	2	15	16	-58
17	Moses Moody M. Moody	111	25	10.6	4.4	1.6	0.5	0.3	0.3	1.5	2.8	53.5	0.8	1.4	57.1	0.6	0.7	83.3	70.3	0.4	1.2	0.2	266	39	12	8	7	5	22	-18
18	Justise Winslow J. Winslow	90	13	25.4	6.9	4.8	0.6	0.6	0.3	2.5	5.7	43.2	0.4	1.4	27.8	1.6	2.3	70.0	51.6	1.3	3.5	0.9	330	63	8	8	4	12	35	-43
19	Shaun Livingston S. Livingston	90	12	27.6	7.5	4.7	4.8	0.6	0.5	3.0	6.3	47.4	0.1	0.1	100.0	1.4	1.8	81.0	52.8	1.3	3.3	1.9	332	56	57	7	6	23	31	+44
20	Jaylen Brown J. Brown	85	17	12.6	5.0	2.1	0.8	0.4	0.1	2.0	4.2	47.9	0.3	1.4	21.7	0.7	1.1	66.7	53.9	0.7	1.4	0.8	215	36	13	6	2	13	26	-25
21	Michael Beasley M. Beasley	85	7	25.5	12.1	7.3	1.0	0.3	1.0	4.9	12.6	38.6	0.6	1.9	30.8	1.9	2.4	76.5	44.5	1.4	5.9	1.6	178	51	7	2	7	11	14	-16
22	Amar'e Stoudemire A. Stoudemire	85	6	33.8	14.2	7.8	1.2	1.7	1.5	5.7	10.8	52.3	0.2	0.2	100.0	2.7	4.7	57.1	55.0	2.7	5.2	3.2	203	47	7	10	9	19	28	-9
23	Shai Gilgeous-Alexander S. Gilgeous-Alexander	82	6	28.7	13.7	2.7	3.2	1.0	0.8	4.7	10.0	46.7	1.5	3.0	50.0	2.8	3.3	85.0	59.6	0.7	2.0	0.8	172	16	19	6	5	5	17	-53
24	Larry Hughes L. Hughes	82	8	24.8	10.3	4.6	2.0	1.9	1.1	3.9	9.6	40.3	0.0	0.9	0.0	2.5	3.0	83.3	46.8	2.1	2.5	1.5	198	37	16	15	9	12	21	+18
25	OG Anunoby	79	10	23.8	7.9	2.1	0.7	0.6	0.4	2.9	5.2	55.8	1.3	2.9	44.8	0.8	1.1	72.7	69.5	0.9	1.2	0.6	238	21	7	6	4	6	23	-23