Wilt Chamberlain grabbed the most boards by a player in his first 6 seasons, with 11,548 rebounds.

Interpreted as:

most rebs by a player first six seasons

	NAME	REB	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	AST	STL	BLK	TOV	PF	+/-
1	Wilt Chamberlain W. Chamberlain	11,548	464	47.0	40.6	24.9	3.1			16.5	32.5	50.7				7.7	13.8	55.3	52.6				21,789	18,837	1,436				867
2	Bill Russell B. Russell	9,555	415	41.8	17.2	23.0	3.4			6.9	15.4	44.7				3.4	6.1	56.4	47.6				17,351	7,124	1,398				1,057
3	Jerry Lucas J. Lucas	8,831	461	43.2	19.7	19.2	3.0			7.9	15.8	49.7				3.9	5.0	78.4	54.5				19,906	9,066	1,399				1,517
4	Elvin Hayes E. Hayes	7,991	490	43.7	25.4	16.3	2.1	1.1	3.0	10.3	23.4	43.8				4.9	7.3	66.8	47.7	4.4	13.7		21,403	12,448	1,021	86	240		1,478
5	Walt Bellamy W. Bellamy	7,654	478	41.2	25.5	16.0	2.5			9.7	18.7	51.6				6.2	9.5	65.3	55.7				19,707	12,187	1,201				1,693
6	Nate Thurmond N. Thurmond	7,402	413	39.3	16.4	17.9	2.4			6.3	15.3	41.4				3.8	6.0	63.1	45.9				16,221	6,778	988				1,130
7	Wes Unseld W. Unseld	7,227	449	38.1	12.9	16.1	3.5	1.0	0.3	5.2	10.6	49.4				2.5	3.8	63.9	52.6	2.7	6.5		17,091	5,811	1,581	56	16		1,268
8	Dave Cowens D. Cowens	7,209	465	40.4	19.1	15.5	3.8	1.2	1.1	8.1	17.8	45.6				2.9	3.7	76.5	49.1	3.7	11.8		18,772	8,872	1,781	276	245		1,826
9	Kareem Abdul-Jabbar K. Abdul-Jabbar	7,161	467	42.7	30.4	15.3	4.3	1.2	3.4	12.6	23.1	54.7				5.2	7.4	69.5	57.7	3.3	11.0		19,954	14,211	2,008	177	495		1,433
10	Moses Malone M. Malone	6,960	466	38.2	23.9	14.9	1.5	0.9	1.6	8.7	16.9	51.4	0.0	0.1	6.7	6.5	8.8	73.6	57.4	6.5	8.5	3.8	17,786	11,119	697	433	758	1,448	1,318
11	Bob Pettit B. Pettit	6,814	429	37.9	25.1	15.9	2.8			8.7	20.6	42.4				7.6	10.1	75.4	50.1				16,241	10,776	1,186				1,267
12	Elgin Baylor E. Baylor	6,621	419	41.8	30.8	15.8	4.4			11.4	26.4	43.0				8.1	10.3	78.2	49.7				17,524	12,892	1,856				1,399
13	Willis Reed W. Reed	6,584	478	36.6	20.0	13.8	1.8			7.9	16.4	48.0				4.2	5.7	74.2	52.8				17,479	9,539	860				1,899
14	Andre Drummond A. Drummond	6,192	463	30.4	13.6	13.4	1.1	1.3	1.5	5.8	10.6	54.5	0.0	0.1	16.7	2.0	4.7	42.1	53.4	4.7	8.7	1.7	14,063	6,291	514	590	707	794	1,434	-543
15	Dwight Howard D. Howard	6,189	489	35.7	17.5	12.7	1.5	0.9	2.1	6.1	10.7	57.5	0.0	0.0	5.3	5.2	8.7	59.9	60.3	3.6	9.1	3.0	17,466	8,538	724	438	1,042	1,476	1,585	+1595
16	Buck Williams B. Williams	6,046	491	36.7	16.7	12.3	1.6	1.0	1.3	6.4	11.6	55.1	0.0	0.0	6.3	3.9	6.1	64.3	58.5	4.2	8.2	3.0	18,017	8,202	789	470	616	1,480	1,755
17	Sam Lacey S. Lacey	6,042	482	37.3	12.8	12.5	3.3	1.6	2.0	5.4	12.5	43.6				2.0	2.7	73.0	47.0	3.1	10.3		17,978	6,179	1,584	397	486		1,651
18	Bob McAdoo B. McAdoo	5,901	465	40.0	27.8	12.7	2.8	1.2	2.1	10.9	21.5	50.7				6.0	7.8	76.8	55.7	3.3	10.2	4.4	18,594	12,918	1,306	455	805	346	1,643
19	Hakeem Olajuwon H. Olajuwon	5,826	468	36.6	23.2	12.4	2.2	2.0	3.4	9.2	17.8	51.5	0.0	0.1	8.0	4.9	7.3	67.8	55.4	4.3	8.1	3.2	17,114	10,878	1,014	922	1,577	1,491	1,876
20	Dikembe Mutombo D. Mutombo	5,740	471	36.9	13.0	12.2	1.6	0.6	3.7	4.7	8.9	52.4	0.0	0.0	0.0	3.6	5.5	65.9	57.2	3.8	8.4	2.6	17,384	6,120	761	272	1,750	1,202	1,610	+432
21	Bob Lanier B. Lanier	5,736	464	35.9	22.1	12.4	3.4	1.2	2.3	9.0	18.1	49.7				4.2	5.4	77.3	54.1	3.2	9.2		16,656	10,275	1,564	264	505		1,560
22	Charles Barkley C. Barkley	5,569	468	37.1	22.7	11.9	3.6	1.6	1.1	8.0	13.7	58.1	0.3	1.3	23.2	6.4	8.6	74.1	64.6	4.6	7.3	3.6	17,382	10,605	1,684	761	529	1,682	1,676
23	David Robinson D. Robinson	5,563	475	38.3	25.7	11.7	3.1	1.7	3.7	9.1	17.3	52.7	0.0	0.2	25.3	7.4	9.9	74.4	59.2	3.4	8.3	3.0	18,187	12,209	1,471	823	1,735	1,436	1,439
24	Tim Duncan T. Duncan	5,548	451	39.3	22.9	12.3	3.2	0.8	2.5	8.7	17.1	51.0	0.0	0.2	18.4	5.4	7.6	71.0	55.9	3.3	9.0	3.1	17,726	10,324	1,447	352	1,129	1,420	1,306	+3087
25	Bailey Howell B. Howell	5,452	467	36.0	20.8	11.7	2.3			7.3	15.3	47.9				6.2	7.9	77.9	55.4				16,801	9,716	1,090				1,831