Jack Sikma vs. Robert Williams III Season by Season Comparison

Side by side comparison of each NBA season of Robert Williams III and Jack Sikma, from their rookie seasons to their last year played, in chronological order with awards, stats, championships and playoff performance of their teams every year.

Player comparisons:
Career comparison / Season by season

Who had the better rookie season? Who had best stats in their 10th season? Who won a championship first? These questions and many others, are answered here.

Jack Sikma played 14 years in the NBA, 8 more than Robert Williams III, who played 6. Jack Sikma had the first of his seasons in 1977-78, while Robert Williams III had his rookie season in 2018-19. With that starting point, here you can take a look at each of their seasons side by side and compare how their careers evolved in achivements, awards and championships won, the stats they recorded both in the Regular Season and the Playoffs and how their teams performed in the postseason.

Their Careers
Player	Total Seasons	Playoffs Played	NBA Years
Jack Sikma	14	11	1977-78 to 1990-91
Robert Williams III	6	5	2018-19 to 2023-24

Comparison Season by Season
Jump to season: 1-2-3-4-5-6-7-8-9-10-11-12-13-14


Rookie Season
	Jack Sikma	Robert Williams III
Season	1977-78	2018-19
Team	Seattle Supersonics	Boston Celtics
Honors & Awards	All-Rookie First Team	-
Playoffs	Supersonics Lost NBA Finals	Celtics Lost East Conf Semis

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	27.3	10.7	2.4	5.9	8.3	1.6	0.8	0.5	2.3	3.7	4.2	9.2	.455	-	-	-	2.3	3.0	.777
Robert Williams III	32	8.8	2.5	0.8	1.7	2.5	0.2	0.3	1.3	0.3	1.1	1.1	1.6	.706	0.0	0.0	-	0.3	0.5	.600

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	22	31.9	13.7	2.3	5.8	8.1	1.2	0.8	0.5	1.6	4.6	5.2	11.2	.466	-	-	-	3.2	4.1	.780
Robert Williams III	3	4.3	1.3	0.3	2.0	2.3	0.0	0.0	0.0	0.0	0.3	0.3	0.7	.500	0.0	0.0	-	0.7	0.7	1.000


Season 2
	Jack Sikma	Robert Williams III
Season	1978-79	2019-20
Team	Seattle Supersonics	Boston Celtics
Honors & Awards	All-Star Game	-
Playoffs	NBA Champion	Celtics Lost East Conf Finals

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	36.1	15.6	2.8	9.5	12.4	3.2	1.0	0.8	3.1	3.6	5.8	12.6	.460	-	-	-	4.0	4.9	.814
Robert Williams III	29	13.4	5.2	1.4	3.0	4.4	0.9	0.8	1.2	0.7	1.8	2.2	3.0	.727	0.0	0.0	-	0.8	1.2	.647

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	17	38.5	14.9	2.3	9.4	11.7	2.5	0.9	1.4	2.4	4.1	6.0	13.2	.455	-	-	-	2.8	3.6	.787
Robert Williams III	13	11.5	3.7	1.7	2.2	3.9	0.8	0.2	0.5	0.5	1.4	1.8	2.4	.742	0.0	0.1	.000	0.2	0.5	.333


Season 3
	Jack Sikma	Robert Williams III
Season	1979-80	2020-21
Team	Seattle Supersonics	Boston Celtics
Honors & Awards	All-Star Game	-
Playoffs	Supersonics Lost West Conf Finals	Celtics Lost East Conf 1st Rd

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	34.1	14.3	2.4	8.7	11.1	3.4	0.8	0.9	2.5	2.8	5.7	12.1	.475	0.0	0.0	.000	2.9	3.6	.805
Robert Williams III	52	18.9	8.0	2.6	4.3	6.9	1.8	0.8	1.8	1.0	2.0	3.6	5.0	.721	0.0	0.0	.000	0.9	1.4	.616

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	15	35.6	11.7	2.0	6.4	8.4	3.7	1.1	0.3	2.3	3.7	4.3	10.9	.399	0.0	0.1	.000	3.1	3.6	.852
Robert Williams III	3	15.3	6.3	2.7	2.3	5.0	0.7	0.3	3.0	0.3	2.3	3.0	4.7	.643	0.0	0.0	-	0.3	0.7	.500


Season 4
	Jack Sikma	Robert Williams III
Season	1980-81	2021-22
Team	Seattle Supersonics	Boston Celtics
Honors & Awards	-	All-Defensive Second Team
Honors & Awards	All-Star Game	-
Playoffs	Did Not Play	Celtics Lost NBA Finals

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	35.6	18.7	2.2	8.1	10.4	3.0	1.0	1.1	2.5	3.4	7.3	16.0	.454	0.0	0.1	.000	4.1	5.0	.823
Robert Williams III	61	29.6	10.0	3.9	5.7	9.6	2.0	0.9	2.2	1.0	2.2	4.4	6.0	.736	0.0	0.0	.000	1.1	1.5	.722

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Robert Williams III	17	23.2	7.7	2.5	3.6	6.2	1.0	0.7	2.2	0.6	2.0	3.1	4.6	.679	0.0	0.1	.000	1.5	1.6	.893


Season 5
	Jack Sikma	Robert Williams III
Season	1981-82	2022-23
Team	Seattle Supersonics	Boston Celtics
Honors & Awards	All-Defensive Second Team	-
Honors & Awards	All-Star Game	-
Playoffs	Supersonics Lost West Conf Semis	Celtics Lost East Conf Finals

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	37.2	19.6	2.7	9.9	12.7	3.4	1.2	1.3	2.6	3.3	7.1	14.8	.479	0.0	0.2	.154	5.5	6.4	.855
Robert Williams III	35	23.5	8.0	3.0	5.4	8.3	1.4	0.6	1.4	1.0	1.9	3.6	4.9	.747	0.0	0.0	.000	0.7	1.2	.610

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	8	39.4	20.5	2.6	9.5	12.1	3.0	1.1	1.0	2.0	4.3	7.1	16.0	.445	0.0	0.0	-	6.3	7.3	.862
Robert Williams III	20	20.9	7.7	1.8	4.2	6.0	1.0	0.5	1.3	0.8	2.2	3.4	4.3	.788	0.0	0.1	.000	1.0	1.4	.679


Season 6
	Jack Sikma	Robert Williams III
Season	1982-83	2023-24
Team	Seattle Supersonics	Portland Trail Blazers
Honors & Awards	All-Star Game	-
Playoffs	Supersonics Lost West Conf 1st Rd	Did Not Play

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	75	34.2	18.2	2.8	8.6	11.4	3.1	1.2	0.9	2.5	3.5	6.5	13.9	.464	0.0	0.1	.000	5.3	6.4	.837
Robert Williams III	6	19.8	6.8	1.8	4.5	6.3	0.8	1.2	1.2	1.2	2.8	2.8	4.3	.654	0.0	0.0	-	1.2	1.5	.778

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	2	37.5	15.0	3.0	10.0	13.0	5.5	1.0	1.0	2.5	3.5	5.5	15.5	.355	0.0	0.5	.000	4.0	6.0	.667
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 7
	Jack Sikma	Robert Williams III
Season	1983-84	-
Team	Seattle Supersonics	-
Honors & Awards	All-Star Game	-
Playoffs	Supersonics Lost West Conf 1st Rd	-

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	36.5	19.1	2.7	8.4	11.1	4.0	1.2	1.1	2.9	3.7	7.0	14.1	.499	0.0	0.0	.000	5.0	5.9	.856
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	5	38.6	22.0	2.2	8.0	10.2	1.0	0.6	1.4	1.8	4.4	9.8	19.6	.500	0.0	0.2	.000	2.4	2.8	.857
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 8
	Jack Sikma	Robert Williams III
Season	1984-85	-
Team	Seattle Supersonics	-
Honors & Awards	All-Star Game	-
Playoffs	Did Not Play	-

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	68	35.3	18.5	2.4	8.2	10.6	4.2	1.2	1.3	2.4	3.5	6.8	13.9	.489	0.0	0.1	.200	4.9	5.8	.852
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 9
	Jack Sikma	Robert Williams III
Season	1985-86	-
Team	Seattle Supersonics	-
Honors & Awards
Playoffs	Did Not Play	-

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	80	34.9	17.1	1.8	7.5	9.4	3.8	1.2	0.9	2.7	3.7	6.4	13.8	.462	0.0	0.2	.000	4.4	5.1	.864
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 10
	Jack Sikma	Robert Williams III
Season	1986-87	-
Team	Milwaukee Bucks	-
Honors & Awards
Playoffs	Bucks Lost East Conf Semis	-

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	30.9	12.7	2.5	7.5	10.0	2.5	1.1	1.1	2.0	4.0	4.8	10.3	.463	0.0	0.0	.000	3.2	3.8	.847
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	12	35.5	16.2	2.8	8.1	10.8	1.9	1.3	0.8	1.5	4.7	6.1	12.5	.487	0.0	0.1	.000	4.0	4.1	.980
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 11
	Jack Sikma	Robert Williams III
Season	1987-88	-
Team	Milwaukee Bucks	-
Honors & Awards
Playoffs	Bucks Lost East Conf 1st Rd	-

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Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	82	35.6	16.5	2.4	6.3	8.6	3.4	1.1	1.0	1.9	3.9	6.3	12.9	.486	0.0	0.2	.214	3.9	4.2	.922
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	5	38.0	19.0	4.8	7.6	12.4	2.6	0.4	0.8	3.0	4.6	7.0	15.2	.461	0.0	0.6	.000	5.0	6.0	.833
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 12
	Jack Sikma	Robert Williams III
Season	1988-89	-
Team	Milwaukee Bucks	-
Honors & Awards
Playoffs	Bucks Lost East Conf Semis	-

more >>

Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	80	32.3	13.4	1.8	6.0	7.8	3.6	1.1	0.8	1.8	3.8	4.5	10.4	.431	1.0	2.7	.380	3.3	3.7	.905
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	9	33.4	11.7	1.0	4.6	5.6	3.3	0.9	0.4	2.3	4.6	4.1	10.4	.394	0.9	3.1	.286	2.6	3.1	.821
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 13
	Jack Sikma	Robert Williams III
Season	1989-90	-
Team	Milwaukee Bucks	-
Honors & Awards
Playoffs	Bucks Lost East Conf 1st Rd	-

more >>

Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	71	31.7	13.9	1.5	5.4	6.9	3.2	1.1	0.7	2.0	3.4	4.8	11.6	.416	1.0	2.8	.342	3.2	3.7	.885
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	4	29.3	5.0	0.0	3.5	3.5	1.8	0.5	1.0	3.0	4.8	1.5	5.8	.261	0.5	1.8	.286	1.5	2.0	.750
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-


Season 14
	Jack Sikma	Robert Williams III
Season	1990-91	-
Team	Milwaukee Bucks	-
Honors & Awards
Playoffs	Bucks Lost East Conf 1st Rd	-

more >>

Regular Season Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	77	25.2	10.4	1.4	4.3	5.7	1.9	0.8	0.8	1.7	2.8	3.8	9.0	.427	0.6	1.8	.341	2.2	2.6	.843
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Playoffs Stats
	G	Min	Pts	ORb	DRb	Reb	Ast	Stl	Blk	TO	PF	FGM / A		%	3PM / A		%	FTM / A		%
Jack Sikma	3	17.0	4.7	1.0	3.0	4.0	2.0	1.7	0.3	1.0	1.3	2.0	5.0	.400	0.3	0.7	.500	0.3	0.7	.500
Robert Williams III	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

Jack Sikma vs. Robert Williams III Season by Season Comparison

Side by side comparison of each NBA season of Robert Williams III and Jack Sikma, from their rookie seasons to their last year played, in chronological order with awards, stats, championships and playoff performance of their teams every year.

Their Careers

Comparison Season by Season

Rookie Season

Season 2

Season 3

Season 4

Season 5

Season 6

Season 7

Season 8

Season 9

Season 10

Season 11

Season 12

Season 13

Season 14