Glenn Robinson III had his best three-point percentage in a season in 2017-18, at 41.2 percent.

NAME	SEASON	TM	GP	3P%	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
Glenn Robinson III	2017-18	IND	23	41.2	14.7	4.1	1.6	0.7	0.6	0.0	0.2	1.6	3.7	42.4	0.6	1.5	0.4	0.5	81.8	338	95	37	17	13	1	5	14	-1
Glenn Robinson III	2016-17	IND	69	39.2	20.7	6.1	3.6	0.7	0.6	0.3	0.5	2.3	4.9	46.7	0.7	1.8	0.8	1.1	71.1	1,427	419	246	47	41	20	37	63	-75
Glenn Robinson III	2019-20	TOT	62	39.1	28.8	11.7	4.4	1.5	0.9	0.3	0.9	4.6	9.5	48.6	1.2	3.2	1.2	1.4	86.0	1,786	727	270	96	54	16	55	100	-296
Glenn Robinson III	2015-16	IND	45	37.8	11.3	3.8	1.5	0.6	0.4	0.2	0.4	1.4	3.4	43.0	0.3	0.8	0.6	0.9	69.2	508	171	68	26	17	9	18	21	-37
Glenn Robinson III	2020-21	SAC	23	36.4	16.0	5.3	2.0	0.9	0.2	0.1	0.5	1.8	4.3	42.4	0.7	1.9	0.9	1.0	91.3	369	121	45	20	4	3	11	23	-131
Glenn Robinson III	2018-19	DET	47	29.0	13.0	4.2	1.5	0.4	0.3	0.2	0.4	1.6	3.7	42.0	0.4	1.3	0.7	0.9	80.0	610	198	71	21	14	8	18	45	-11
Glenn Robinson III	2014-15	TOT	35	26.3	7.5	2.1	1.1	0.3	0.2	0.0	0.3	0.7	1.9	38.8	0.1	0.5	0.5	0.7	66.7	261	73	39	11	6	1	11	15	+27

StatMuse has season-level data for three-point percentage going back to the 1979-80 season.