Marcus Williams averaged his most career points per game versus the Celtics, with 9.3 per game.

marcus williams highest career ppg by opponent

NAME	PPG	OPP	GP	MPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
Marcus Williams	9.3	Celtics	6	20.0	3.2	5.0	0.3	0.0	1.8	3.5	7.5	46.7	0.7	2.2	30.8	1.7	1.8	90.9	120	56	19	30	2	0	11	8	+16
Marcus Williams	9.0	Clippers	6	18.3	1.5	3.5	0.7	0.0	1.7	3.2	7.0	45.2	0.8	2.7	31.3	1.8	2.0	91.7	110	54	9	21	4	0	10	10	-20
Marcus Williams	8.6	Suns	8	14.2	1.8	2.8	0.4	0.0	0.9	3.5	6.4	54.9	0.6	2.1	29.4	1.0	1.3	80.0	113	69	14	22	3	0	7	8	+5
Marcus Williams	8.3	Thunder	3	17.0	2.0	2.7	0.3	0.0	2.0	3.3	6.3	52.6	0.7	1.3	50.0	1.0	1.3	75.0	51	25	6	8	1	0	6	5	+6
Marcus Williams	8.3	Bulls	8	16.8	1.5	2.4	1.0	0.1	2.0	3.1	7.1	43.9	1.0	2.4	42.1	1.0	1.6	61.5	134	66	12	19	8	1	16	12	-26
Marcus Williams	8.3	Pacers	8	21.2	3.9	4.9	0.3	0.3	2.1	2.6	5.8	45.7	1.4	2.5	55.0	1.6	1.9	86.7	170	66	31	39	2	2	17	11	+25
Marcus Williams	8.0	Spurs	6	24.1	3.0	4.0	0.8	0.2	2.3	3.3	8.2	40.8	1.2	2.5	46.7	0.2	0.7	25.0	145	48	18	24	5	1	14	13	-25
Marcus Williams	7.8	Jazz	6	18.5	1.3	3.5	0.7	0.0	1.7	2.7	7.0	38.1	0.5	2.3	21.4	2.0	2.2	92.3	111	47	8	21	4	0	10	6	-28
Marcus Williams	7.1	Raptors	9	20.7	2.1	3.0	0.8	0.0	1.8	2.8	7.4	37.3	0.3	2.4	13.6	1.2	1.4	84.6	186	64	19	27	7	0	16	11	-60
Marcus Williams	6.6	Rockets	8	18.1	1.9	3.9	0.6	0.0	1.4	2.6	6.6	39.6	0.3	1.6	15.4	1.1	1.6	69.2	145	53	15	31	5	0	11	8	-4
Marcus Williams	6.1	Nuggets	8	14.7	1.8	3.5	0.4	0.0	1.9	2.1	4.5	47.2	0.9	1.8	50.0	1.0	1.8	57.1	118	49	14	28	3	0	15	3	-5
Marcus Williams	6.0	Grizzlies	4	15.8	2.3	4.3	0.5	0.3	1.8	2.3	6.0	37.5	1.0	2.3	44.4	0.5	1.0	50.0	63	24	9	17	2	1	7	5	-3
Marcus Williams	5.8	Heat	8	13.2	1.5	1.9	0.3	0.1	1.1	2.3	5.8	39.1	0.5	2.3	22.2	0.8	0.9	85.7	106	46	12	15	2	1	9	8	+7
Marcus Williams	5.5	Nets	2	15.3	0.5	2.5	0.5	0.0	1.0	2.0	5.5	36.4	1.0	2.0	50.0	0.5	0.5	100.0	31	11	1	5	1	0	2	2	+23
Marcus Williams	5.3	Bucks	9	16.0	2.2	2.8	0.8	0.0	1.4	1.9	5.8	32.7	1.0	2.1	47.4	0.6	0.9	62.5	144	48	20	25	7	0	13	13	-11
Marcus Williams	5.0	Hornets	6	13.6	1.2	2.8	0.5	0.0	1.3	1.8	4.5	40.7	0.5	1.7	30.0	0.8	1.0	83.3	81	30	7	17	3	0	8	8	+10
Marcus Williams	5.0	Lakers	5	11.2	0.0	1.8	0.2	0.0	0.6	2.2	5.6	39.3	0.6	2.2	27.3	0.0	0.0		56	25	0	9	1	0	3	1	-23
Marcus Williams	4.9	Magic	9	13.2	1.4	2.8	0.1	0.0	1.6	1.8	4.8	37.2	0.7	1.7	40.0	0.7	0.8	85.7	119	44	13	25	1	0	14	2	-18
Marcus Williams	4.9	Pistons	7	15.1	2.3	1.7	0.4	0.0	1.7	2.0	6.3	31.8	0.3	2.1	13.3	0.6	0.6	100.0	106	34	16	12	3	0	12	8	-43
Marcus Williams	4.7	Hawks	9	12.8	2.0	2.4	0.4	0.0	1.2	1.9	4.3	43.6	0.4	1.2	36.4	0.4	0.6	80.0	115	42	18	22	4	0	11	4	-3
Marcus Williams	4.6	Warriors	7	14.1	1.9	2.4	0.7	0.0	1.1	1.9	5.7	32.5	0.9	2.1	40.0	0.0	0.0		99	32	13	17	5	0	8	4	-25
Marcus Williams	4.4	Knicks	7	12.0	1.9	2.4	0.0	0.0	1.9	1.4	4.1	34.5	0.9	2.3	37.5	0.7	0.7	100.0	84	31	13	17	0	0	13	5	-23
Marcus Williams	4.0	Trail Blazers	1	3.2	0.0	0.0	0.0	0.0	0.0	2.0	2.0	100.0	0.0	0.0		0.0	0.0		3	4	0	0	0	0	0	0	+1
Marcus Williams	4.0	Nuggets	1	5.3	4.0	0.0	0.0	0.0	0.0	2.0	5.0	40.0	0.0	0.0		0.0	0.0		5	4	4	0	0	0	0	1	+10
Marcus Williams	4.0	Kings	1	2.7	1.0	0.0	1.0	0.0	0.0	2.0	2.0	100.0	0.0	0.0		0.0	0.0		3	4	1	0	1	0	0	0	+3