Kobe Bryant has the most career games by a player younger than 21, with 200 games.

Interpreted as:

most regular-season game before turning 21 years old by a player

	NAME	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	Kobe Bryant K. Bryant	200	25.3	13.8	3.2	2.4	1.0	0.6	4.6	10.6	43.9	0.8	2.3	33.5	3.7	4.6	81.3	54.7	0.9	2.3	2.1	5,055	2,755	638	480	195	113	426	435	+416
2	Tracy McGrady T. McGrady	192	24.7	11.1	5.5	2.5	1.0	1.4	4.2	9.4	44.8	0.2	0.7	28.4	2.4	3.4	71.2	50.7	2.2	3.3	1.6	4,747	2,122	1,048	474	191	278	306	381	-262
3	LeBron James L. James	186	41.0	25.0	6.4	6.4	1.9	0.7	9.1	20.1	45.4	1.1	3.5	33.0	5.6	7.4	75.5	53.4	1.2	5.2	3.4	7,629	4,649	1,187	1,193	352	135	626	361	+165
4	Dwight Howard D. Howard	184	34.9	14.2	11.5	1.3	0.8	1.6	5.1	9.5	53.5	0.0	0.0	0.0	4.0	6.4	62.9	57.6	3.5	7.9	2.4	6,415	2,619	2,109	233	152	292	449	562	-106
5	Giannis Antetokounmpo G. Antetokounmpo	178	28.6	10.5	5.7	2.3	0.8	0.9	3.8	8.1	47.1	0.3	1.1	29.7	2.6	3.6	73.7	54.7	1.1	4.5	1.9	5,095	1,874	1,006	410	151	169	342	502	-254
6	Andris Biedrins A. Biedrins	172	21.0	6.5	6.5	0.7	0.6	1.2	2.9	4.8	60.8	0.0	0.0	0.0	0.7	1.6	46.0	59.7	2.4	4.1	0.9	3,606	1,122	1,122	120	97	199	159	551	+131
7	Eddy Curry E. Curry	171	19.2	9.3	4.4	0.5	0.2	0.8	3.6	6.7	54.0	0.0	0.0		2.1	3.2	64.5	57.4	1.5	2.8	1.5	3,283	1,585	744	81	41	136	255	471	-520
8	Josh Smith J. Smith	169	30.5	10.6	6.6	2.1	0.8	2.3	3.9	9.1	43.2	0.3	1.1	27.1	2.5	3.5	70.3	49.8	2.1	4.5	2.0	5,159	1,799	1,110	363	142	381	338	467	-697
9	Andrew Bynum A. Bynum	163	19.3	7.2	5.6	1.0	0.2	1.4	2.9	5.0	57.1	0.0	0.0	0.0	1.4	2.2	64.9	59.7	1.7	3.9	1.1	3,140	1,171	920	164	28	222	184	403	+80
10	Darius Miles D. Miles	163	26.7	9.4	5.7	1.7	0.7	1.4	3.8	7.8	49.3	0.0	0.2	10.5	1.7	3.0	57.2	51.7	1.4	4.3	1.9	4,360	1,540	930	283	122	228	307	375	+36
11	Martell Webster M. Webster	161	21.4	7.4	2.9	0.7	0.4	0.3	2.6	6.4	40.2	1.1	3.2	35.9	1.1	1.5	75.5	52.7	0.5	2.3	0.9	3,444	1,193	461	111	69	45	145	258	-481
12	Devin Booker D. Booker	160	31.5	18.1	3.0	3.1	0.8	0.3	6.4	15.0	42.4	1.6	4.5	35.5	3.8	4.5	83.5	53.3	0.5	2.5	2.6	5,033	2,897	473	494	122	43	419	481	-642
13	Tony Parker T. Parker	159	31.7	12.4	2.6	4.8	1.0	0.1	4.7	10.6	44.7	0.9	2.7	33.1	2.1	2.8	72.7	52.5	0.4	2.2	2.2	5,041	1,974	413	766	160	11	349	340	+627
14	Carmelo Anthony C. Anthony	157	35.7	20.9	5.9	2.7	1.1	0.5	7.4	17.2	42.8	0.7	2.4	29.8	5.5	7.0	78.7	51.7	2.1	3.8	3.0	5,603	3,283	924	421	165	71	471	454	+231
15	Kevin Garnett K. Garnett	157	33.7	13.7	7.1	2.4	1.2	1.9	5.8	11.7	49.6	0.1	0.3	28.6	2.0	2.7	73.6	53.1	2.3	4.8	1.8	5,288	2,144	1,119	381	191	294	285	388	+116
16	Bill Willoughby B. Willoughby	157		5.5					2.2						1.1	1.5	71.2						861
17	Maurice Harkless M. Harkless	156	25.1	7.8	3.8	0.8	1.2	0.7	3.1	6.7	46.2	0.6	1.7	33.6	1.0	1.7	58.3	52.2	1.2	2.6	1.0	3,923	1,217	599	130	185	112	155	284	-774
18	Jabari Smith Jr. J. Smith Jr.	155	31.4	13.3	7.6	1.4	0.6	0.9	4.8	11.1	43.0	1.7	5.0	33.5	2.0	2.5	79.8	54.1	1.7	6.0	1.2	4,874	2,054	1,185	222	95	135	193	427	-638
19	Jrue Holiday J. Holiday	155	30.1	11.2	3.4	5.2	1.3	0.3	4.4	9.8	44.5	0.9	2.5	37.5	1.5	1.9	80.3	52.5	0.8	2.6	2.4	4,667	1,732	523	811	199	47	374	356	+14
20	Marquese Chriss M. Chriss	154	21.2	8.5	4.8	0.9	0.8	0.9	3.2	7.2	43.8	0.8	2.7	30.9	1.4	2.2	61.7	52.0	1.1	3.7	1.4	3,270	1,309	743	143	118	140	215	468	-677
21	Kevin Durant K. Durant	154	36.7	22.7	5.4	2.6	1.1	0.8	8.1	17.9	45.3	1.0	2.8	35.9	5.5	6.3	86.7	54.9	1.0	4.4	3.0	5,653	3,495	830	397	174	128	457	256	-1152
22	Jarrett Allen J. Allen	152	23.3	9.6	7.0	1.0	0.5	1.4	3.7	6.3	59.0	0.1	0.4	18.3	2.0	2.8	73.2	63.4	2.2	4.8	1.2	3,537	1,460	1,060	159	71	208	185	331	-264
23	Stanley Johnson S. Johnson	150	20.4	6.2	3.3	1.5	0.7	0.2	2.4	6.4	36.7	0.7	2.4	30.1	0.8	1.0	74.8	45.1	0.6	2.7	1.2	3,058	932	495	223	111	36	185	299	-138
24	Eddie Griffin E. Griffin	150	25.2	8.7	5.8	0.9	0.5	1.6	3.4	9.0	38.3	1.0	3.1	33.1	0.8	1.2	67.8	45.9	1.7	4.1	0.8	3,786	1,306	877	139	69	245	123	253	-10
25	Thaddeus Young T. Young	149	27.7	11.8	4.6	1.0	1.2	0.2	5.0	9.7	51.0	0.4	1.2	33.9	1.4	2.0	73.6	55.6	1.7	2.9	1.2	4,134	1,755	689	144	173	31	182	291	+330