most rpg as an 21 year old rookie while playing 1+ games

Buck Williams has grabbed the most rebounds per game by a 21-year-old rookie with 1+ game played, with 12.3 per game in 1981-82.

	NAME	RPG	AGE	GP	SEASON	TM	MPG	PPG	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	Buck Williams B. Williams	12.3	21	82	1981-82	NJN	34.5	15.5	1.3	1.0	1.0	6.3	10.7	58.2	0.0	0.0	0.0	3.0	4.7	62.4	60.3	4.2	8.0	2.9	2,825	1,268	1,005	107	84	84	235	285
2	Blake Griffin B. Griffin	12.1	21	82	2010-11	LAC	38.0	22.5	3.8	0.8	0.5	8.5	16.8	50.6	0.1	0.3	29.2	5.4	8.5	64.2	54.9	3.3	8.8	2.7	3,112	1,845	989	312	63	45	223	252	-146
3	Tim Duncan T. Duncan	11.9	21	82	1997-98	SAS	39.1	21.1	2.7	0.7	2.5	8.6	15.7	54.9	0.0	0.1	0.0	3.9	5.9	66.2	57.7	3.3	8.6	3.4	3,204	1,731	977	224	55	206	279	254	+429
4	Terry Cummings T. Cummings	10.6	21	70	1982-83	SDC	36.2	23.7	2.5	1.8	0.9	9.8	18.7	52.3	0.0	0.0	0.0	4.2	5.9	70.9	55.7	4.3	6.3	2.9	2,531	1,660	744	177	129	62	204	294
5	Rick Barry R. Barry	10.6	21	80	1965-66	SFW	37.4	25.7	2.2			9.3	21.2	43.9				7.1	8.3	86.2	51.8				2,990	2,059	850	173				297
6	Clark Kellogg C. Kellogg	10.6	21	81	1982-83	IND	34.1	20.1	2.8	1.7	0.5	8.4	17.5	47.9	0.0	0.2	22.2	3.2	4.3	74.1	51.6	4.2	6.4	2.7	2,761	1,625	860	223	141	43	217	298
7	Marques Johnson M. Johnson	10.6	21	80	1977-78	MIL	34.6	19.5	2.4	1.2	1.3	7.9	15.1	52.2				3.8	5.1	73.6	56.3	3.7	6.9	2.2	2,765	1,557	847	190	92	103	175	221
8	Reggie Harding R. Harding	10.5	21	39	1963-64	DET	29.7	11.0	1.3			4.7	11.8	40.0				1.6	2.5	62.2	42.6				1,158	429	410	52				119
9	Al Horford A. Horford	9.7	21	81	2007-08	ATL	31.4	10.1	1.5	0.7	0.9	4.1	8.2	49.9	0.0	0.1	0.0	1.9	2.6	73.1	53.9	3.1	6.6	1.7	2,540	821	785	124	60	76	137	267	-111
10	Eddie Miller E. Miller	9.6	21	70	1952-53	TOT	28.8	10.5	1.6			3.9	11.2	35.0				2.7	4.1	65.2	40.4				2,018	733	669	115				250
11	Bernard King B. King	9.5	21	79	1977-78	NJN	39.1	24.2	2.4	1.5	0.5	10.1	21.1	47.9				4.0	5.8	67.7	51.1	3.4	6.2	3.9	3,092	1,909	751	193	122	36	311	302
12	Bob McAdoo B. McAdoo	9.1	21	80	1972-73	BUF	32.0	18.0	1.7			7.3	16.2	45.2				3.4	4.4	77.4	49.8				2,562	1,441	728	139				256
13	Alvan Adams A. Adams	9.1	21	80	1975-76	PHX	33.2	19.0	5.6	1.5	1.5	7.9	16.8	46.9				3.3	4.4	73.5	50.7	2.7	6.4		2,656	1,519	727	450	121	116		274
14	Wayne Embry W. Embry	9.0	21	66	1958-59	CIN	24.1	11.4	1.5			4.1	10.6	38.7				3.1	4.8	65.6	44.6				1,590	750	597	96				232
15	Pau Gasol P. Gasol	8.9	21	82	2001-02	MEM	36.7	17.6	2.7	0.5	2.1	6.7	13.0	51.8	0.0	0.1	20.0	4.1	5.8	70.9	56.6	2.9	6.0	2.7	3,007	1,441	730	223	41	169	224	195	-310
16	Mike Sojourner M. Sojourner	8.8	21	73	1974-75	ATL	29.2	11.7	1.3	0.5	0.8	5.2	10.6	48.8				1.3	2.0	65.1	50.7	2.7	6.1		2,129	851	642	93	35	57		217
17	Charles Barkley C. Barkley	8.6	21	82	1984-85	PHI	28.6	14.0	1.9	1.2	1.0	5.2	9.5	54.5	0.0	0.1	16.7	3.6	4.9	73.3	59.9	3.2	5.3	2.5	2,347	1,148	703	155	95	80	209	301
18	Richard Washington R. Washington	8.5	21	82	1976-77	KCK	27.6	13.0	1.0	0.8	1.1	5.4	12.6	43.1				2.2	3.1	69.7	46.7	2.5	6.1		2,265	1,069	698	85	63	90		324
19	J.R. Reid	8.4	21	82	1989-90	CHA	33.6	11.1	1.2	1.1	0.7	4.4	9.9	44.0	0.0	0.1	0.0	2.3	3.5	66.4	48.2	2.4	6.0	2.1	2,757	908	691	101	92	54	172	292
20	Juwan Howard J. Howard	8.4	21	65	1994-95	WAS	36.1	17.0	2.5	0.8	0.2	7.0	14.3	48.9	0.0	0.1	0.0	3.0	4.5	66.4	52.1	2.8	5.6	2.6	2,348	1,104	545	165	52	15	166	236
21	Walker Kessler W. Kessler	8.4	21	74	2022-23	UTA	23.0	9.2	0.9	0.4	2.3	4.0	5.6	72.0	0.0	0.0	33.3	1.1	2.1	51.6	70.2	3.1	5.3	0.8	1,703	679	620	69	26	173	58	169	+72
22	Jamaal Wilkes J. Wilkes	8.2	21	82	1974-75	GSW	30.7	14.2	2.2	1.3	0.3	6.1	13.8	44.2				2.0	2.7	73.4	47.3	2.5	5.7		2,515	1,164	671	183	107	22		222
23	Ben Simmons B. Simmons	8.1	21	81	2017-18	PHI	33.7	15.8	8.2	1.7	0.9	6.7	12.3	54.5	0.0	0.1	0.0	2.4	4.2	56.0	55.7	1.8	6.3	3.4	2,732	1,279	659	661	140	70	278	211	+387
24	Brad Daugherty B. Daugherty	8.1	21	80	1986-87	CLE	33.7	15.7	3.8	0.6	0.8	6.1	11.3	53.8	0.0	0.0		3.5	5.0	69.6	57.9	1.9	6.2	3.1	2,695	1,253	647	304	49	63	248	248
25	Chet Holmgren C. Holmgren	7.9	21	82	2023-24	OKC	29.4	16.5	2.4	0.6	2.3	6.2	11.6	53.0	1.6	4.3	37.0	2.7	3.4	79.3	63.2	1.6	6.3	1.6	2,413	1,357	648	200	53	190	131	197	+422