Cliff Robinson has the most points by a player younger than 20 in a game, with 45 points against the Pistons on March 9, 1980.

Interpreted as:

NBA most points by a player in a regular-season game by a teenager

	NAME	PTS	AGE	DATE	TM		OPP	MIN	REB	AST	STL	BLK	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TOV	PF	+/-
1	Cliff Robinson C. Robinson	45	19-362	3/9/1980	NJN	vs	DET	36	10	4			19	28	67.9	1			6	7	85.7	72.4				3
2	GG Jackson	44	19-119	4/14/2024	MEM	vs	DEN	44	12	1	2	1	17	36	47.2	4	13	30.8	6	7	85.7	56.3	6	6	3	1	-13
3	LeBron James L. James	43	19-330	11/24/2004	CLE	vs	DET	38	6	5	3	1	15	22	68.2	2	3	66.7	11	12	91.7	78.8	3	3	3	3	+12
4	Anthony Edwards A. Edwards	42	19-273	5/5/2021	MIN	vs	MEM	38	6	7	1	1	17	22	77.3	8	9	88.9	0	1	0.0	93.6	1	5	3	4	+11
5	Anthony Edwards A. Edwards	42	19-225	3/18/2021	MIN	@	PHX	38	7	3	2	0	15	31	48.4	4	13	30.8	8	13	61.5	57.2	3	4	2	2	+9
6	Kevin Durant K. Durant	42	19-200	4/16/2008	SEA	@	GSW	43	13	6	1	2	18	25	72.0	1	2	50.0	5	6	83.3	76.0	3	10	5	0	+14
7	Carmelo Anthony C. Anthony	41	19-306	3/30/2004	DEN	vs	SEA	44	5	0	2	1	19	29	65.5	2	3	66.7	1	1	100.0	69.6	0	5	4	5	+3
8	LeBron James L. James	41	19-088	3/27/2004	CLE	vs	NJN	43	6	13	3	0	15	29	51.7	1	2	50.0	10	10	100.0	61.4	2	4	2	1	+10
9	LeBron James L. James	40	19-364	12/28/2004	CLE	@	ATL	46	9	7	1	0	13	25	52.0	3	5	60.0	11	14	78.6	64.2	1	8	1	2	+8
10	Carmelo Anthony C. Anthony	39	19-249	2/2/2004	DEN	vs	POR	34	3	0	3	0	14	22	63.6	1	2	50.0	10	14	71.4	69.2	1	2	2	3	+14
11	Victor Wembanyama V. Wembanyama	38	19-302	11/2/2023	SAS	@	PHX	34	10	2	1	2	15	26	57.7	3	6	50.0	5	6	83.3	66.3	2	8	2	3	+21
12	LeBron James L. James	38	19-316	11/10/2004	CLE	vs	PHX	48	10	6	3	3	13	24	54.2	1	2	50.0	11	12	91.7	64.9	3	7	3	1	+14
13	LeBron James L. James	38	19-033	2/1/2004	CLE	@	WAS	43	6	4	0	2	14	27	51.9	1	2	50.0	9	11	81.8	59.7	3	3	6	4	0
14	Anfernee Simons A. Simons	37	19-306	4/10/2019	POR	vs	SAC	48	6	9	1	0	13	21	61.9	7	11	63.6	4	6	66.7	78.3	3	3	2	2	+5
15	Kevin Durant K. Durant	37	19-190	4/6/2008	SEA	vs	DEN	51	8	9	3	0	11	24	45.8	2	4	50.0	13	13	100.0	62.2	0	8	5	2	-2
16	Carmelo Anthony C. Anthony	37	19-211	12/26/2003	DEN	vs	HOU	41	7	2	1	0	13	22	59.1	5	8	62.5	6	11	54.5	68.9	1	6	1	4	+6
17	LeBron James L. James	37	18-348	12/13/2003	CLE	vs	BOS	45	3	4	0	0	10	20	50.0	1	5	20.0	16	18	88.9	66.3	1	2	2	2	-2
18	Zaccharie Risacher Z. Risacher	36	19-356	3/30/2025	ATL	@	MIL	35	6	0	1	0	12	21	57.1	5	11	45.5	7	9	77.8	72.1	4	2	1	3	+19
19	Jaren Jackson Jr. J. Jackson Jr.	36	19-076	11/30/2018	MEM	@	BKN	43	8	2	0	0	13	22	59.1	3	7	42.9	7	7	100.0	71.8	3	5	1	4	+13
20	Carmelo Anthony C. Anthony	36	19-314	4/7/2004	DEN	@	PHX	38	11	1	1	0	12	20	60.0	1	2	50.0	11	12	91.7	71.2	4	7	3	3	+11
21	LeBron James L. James	36	18-354	12/19/2003	CLE	@	PHI	42	4	5	4	0	14	24	58.3	5	7	71.4	3	3	100.0	71.1	1	3	4	1	+9
22	GG Jackson	35	19-094	3/20/2024	MEM	@	GSW	35	5	3	0	0	11	19	57.9	7	14	50.0	6	7	85.7	79.3	1	4	1	2	-8
23	Zion Williamson Z. Williamson	35	19-239	3/1/2020	NOP	vs	LAL	33	7	0	0	0	12	16	75.0	0	0		11	13	84.6	80.6	2	5	6	2	-10
24	Luka Dončić L. Dončić	35	19-339	2/2/2019	DAL	@	CLE	33	11	6	1	0	13	25	52.0	4	11	36.4	5	7	71.4	62.3	1	10	2	4	+8
25	Luka Dončić L. Dončić	35	19-333	1/27/2019	DAL	vs	TOR	36	12	10	0	0	14	24	58.3	3	9	33.3	4	6	66.7	65.7	2	10	3	3	-2