Devin Booker had the most points by a player in the playoffs in his first playoff, with 601 points.

most points by a player in first nba playoff

NAME	PTS	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	REB	AST	STL	BLK	TOV	PF	+/-
Devin Booker	601	22	40.4	27.3	5.6	4.5	0.8	0.2	3.7	9.6	21.5	44.7	2.0	6.2	32.1	6.0	6.7	90.5	889	124	100	18	4	81	76	+112
Rick Barry	521	15	40.9	34.7	7.5	3.9				13.1	32.6	40.3				8.5	10.5	80.9	614	113	58				49
Julius Erving	518	19	39.9	27.3	6.4	4.5	2.2	1.2		10.7	20.5	52.3				5.8	7.1	82.1	758	122	85	41	23		45
Trae Young	461	16	37.7	28.8	2.8	9.5	1.3	0.0	4.0	9.4	22.4	41.8	2.8	9.0	31.3	7.3	8.4	86.6	603	45	152	20	0	64	35	-7
Maurice Lucas	403	19	38.5	21.2	9.9	4.2	1.5	1.2		8.6	16.6	51.9				3.9	5.3	74.3	731	188	79	28	23		79
Carlos Boozer	400	17	38.5	23.5	12.2	2.9	1.0	0.3	3.0	9.5	17.8	53.6	0.0	0.0		4.5	6.1	73.8	654	207	50	17	5	51	52	+5
LeBron James	400	13	46.5	30.8	8.1	5.8	1.4	0.7	5.0	11.2	23.6	47.6	1.6	4.8	33.3	6.7	9.1	73.7	604	105	76	18	9	65	44	-49
Paul Pierce	394	16	42.0	24.6	8.6	4.1	1.7	1.3	3.8	7.6	18.9	40.3	1.9	6.5	28.8	7.5	9.8	76.4	672	137	66	27	20	61	52	+63
Richard Hamilton	383	17	38.8	22.5	3.9	2.6	0.8	0.1	3.4	7.9	17.8	44.2	0.5	1.6	33.3	6.2	6.9	90.6	659	66	45	13	1	57	51	+26
Boris Diaw	374	20	39.8	18.7	6.7	5.2	0.9	1.1	2.8	7.6	14.5	52.6	0.2	0.4	42.9	3.4	4.4	76.1	796	133	104	18	22	55	64	+44
Jordan Poole	373	22	27.5	17.0	2.8	3.8	0.8	0.4	2.4	5.9	11.5	50.8	2.3	5.8	39.1	3.0	3.2	91.5	606	62	83	17	8	53	62	+51
James Worthy	371	21	33.7	17.7	5.0	2.7	1.3	0.5	1.9	7.8	13.0	59.9	0.0	0.1	50.0	2.0	3.3	60.9	708	105	56	27	11	39	57
Antoine Walker	354	16	43.9	22.1	8.6	3.3	1.5	0.4	3.4	8.2	19.9	41.1	2.6	6.8	38.5	3.1	4.0	78.1	703	138	52	24	6	55	56	+50
Dennis Johnson	354	22	37.6	16.1	4.6	3.3	1.0	1.0	2.5	5.5	13.4	41.2				5.1	7.2	70.4	827	101	72	23	23	56	63
Nikola Jokic	352	14	39.8	25.1	13.0	8.4	1.1	0.9	2.6	9.4	18.6	50.6	1.6	4.0	39.3	4.7	5.6	84.6	557	182	118	16	13	36	54	+84
Kareem Abdul-Jabbar	352	10	43.5	35.2	16.8	4.1				13.9	24.5	56.7				7.4	10.1	73.3	435	168	41				25
Jayson Tatum	351	19	35.9	18.5	4.4	2.7	1.2	0.5	2.2	6.5	13.7	47.1	1.2	3.7	32.4	4.3	5.1	84.5	683	83	52	23	10	41	50	+51
Deandre Ayton	347	22	36.4	15.8	11.8	1.1	0.8	1.1	1.3	7.0	10.6	65.8	0.0	0.0		1.8	2.4	73.6	801	260	25	18	24	28	63	+82
Bill Walton	345	19	39.7	18.2	15.2	5.5	1.1	3.4		8.1	15.9	50.7				2.1	3.0	68.4	755	288	104	20	64		80
Alvan Adams	341	19	35.2	17.9	10.1	5.2	1.3	1.1		7.2	15.9	45.2				3.5	4.3	81.7	668	191	98	24	20		60
Kenyon Martin	336	20	37.5	16.8	5.8	2.9	1.2	1.3	2.6	6.5	15.2	42.4	0.1	0.5	22.2	3.8	5.5	69.1	749	116	57	24	25	52	86	+21
Tyler Herro	335	21	33.6	16.0	5.1	3.7	0.4	0.1	2.0	5.7	13.2	43.3	2.3	6.1	37.5	2.2	2.6	87.0	706	107	77	8	2	42	31	+1
Elgin Baylor	331	13	42.8	25.5	12.0	3.3				9.4	23.3	40.3				6.7	8.7	77.0	556	156	43				52
Lionel Hollins	328	19	35.9	17.3	2.7	4.5	2.5	0.3		7.1	16.9	41.7				3.2	4.6	68.2	682	52	85	47	5		74
Deron Williams	327	17	38.6	19.2	4.3	8.6	1.5	0.2	4.0	7.2	15.9	45.2	1.1	3.4	33.3	3.8	4.8	79.0	657	73	146	26	4	68	49	+11