Ernie DiGregorio has the highest free-throw percentage by a rookie, at 90.2 percent in 1973-74.

which rookie has the highest free throw percentage in a season

Interpreted as:

Which rookie has the highest free throw percentage with a minimum of 125 free-throws made per 82 team games in a season?

NAME	FT%	SEASON	TM	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
Ernie DiGregorio	90.2	1973-74	BUF	81	35.9	15.2	2.7	8.2	0.7	0.1		6.5	15.6	42.1				2.1	2.4	2,910	1,234	219	663	59	9		242
Chris Mullin	89.6	1985-86	GSW	55	25.3	14.0	2.1	1.9	1.3	0.4	1.4	5.2	11.3	46.3	0.1	0.5	18.5	3.4	3.8	1,391	768	115	105	70	23	75	130
D.J. Augustin	89.3	2008-09	CHA	72	26.5	11.8	1.8	3.5	0.6	0.0	1.7	3.7	8.6	43.0	1.5	3.4	43.9	2.9	3.2	1,908	850	133	250	42	2	119	140	-39
Immanuel Quickley	89.1	2020-21	NYK	64	19.4	11.4	2.1	2.0	0.5	0.2	0.9	3.6	9.1	39.5	1.8	4.7	38.9	2.4	2.7	1,243	731	137	127	30	12	58	114	+182
Bill Sharman	88.9	1950-51	WAS	31		12.2	3.5	1.3				4.5	12.3	37.0				3.1	3.5		378	110	39				86
Stephen Curry	88.5	2009-10	GSW	80	36.2	17.5	4.5	5.9	1.9	0.2	3.0	6.6	14.3	46.2	2.1	4.8	43.7	2.2	2.5	2,896	1,399	356	472	152	19	243	252	-186
O.J. Mayo	87.9	2008-09	MEM	82	38.0	18.5	3.8	3.2	1.1	0.2	2.8	6.9	15.6	43.8	1.8	4.6	38.4	3.0	3.4	3,120	1,516	308	262	91	13	226	204	-416
Winston Garland	87.9	1987-88	GSW	67	31.7	12.4	3.4	6.4	1.7	0.1	2.5	5.1	11.6	43.9	0.2	0.6	33.3	2.1	2.3	2,122	831	227	429	116	7	167	188
Derek Anderson	87.3	1997-98	CLE	66	27.9	11.7	2.8	3.4	1.3	0.2	1.9	3.6	8.9	40.8	0.3	1.3	20.2	4.2	4.8	1,839	770	187	227	86	13	128	136	+106
Kevin Durant	87.3	2007-08	SEA	80	34.6	20.3	4.4	2.4	1.0	0.9	2.9	7.3	17.1	43.0	0.7	2.6	28.8	4.9	5.6	2,768	1,624	348	192	78	75	232	122	-651
Dee Brown	87.3	1990-91	BOS	82	23.7	8.7	2.2	4.2	1.0	0.2	1.7	3.5	7.5	46.4	0.1	0.4	20.6	1.7	1.9	1,945	712	182	344	83	14	137	161
Kyrie Irving	87.2	2011-12	CLE	51	30.5	18.5	3.7	5.4	1.1	0.4	3.1	6.9	14.6	46.9	1.4	3.6	39.9	3.4	3.8	1,558	944	191	275	54	20	160	110	-160
Dick Schnittker	86.6	1950-51	WAS	29		10.2	5.3	1.4				3.0	7.2	41.1				4.2	4.9		295	153	41				82
Sean Elliott	86.6	1989-90	SAS	81	25.1	10.0	3.7	1.9	0.6	0.2	1.4	3.8	8.0	48.1	0.0	0.1	11.1	2.3	2.7	2,032	810	297	154	45	14	112	172
Franz Wagner	86.3	2021-22	ORL	79	30.7	15.2	4.5	2.9	0.9	0.4	1.5	5.8	12.3	46.8	1.2	3.4	35.4	2.4	2.8	2,429	1,197	356	231	68	34	119	164	-243
Ben Gordon	86.3	2004-05	CHI	82	24.4	15.1	2.6	2.0	0.6	0.1	2.3	5.3	12.9	41.1	1.6	4.0	40.5	2.8	3.3	2,002	1,235	215	164	53	10	186	224	+146
Rick Barry	86.2	1965-66	SFW	80	37.4	25.7	10.6	2.2				9.3	21.2	43.9				7.1	8.3	2,990	2,059	850	173				297
Eric Gordon	85.4	2008-09	LAC	78	34.3	16.1	2.6	2.8	1.0	0.4	2.1	5.3	11.6	45.6	1.7	4.3	38.9	3.8	4.5	2,677	1,252	201	215	78	35	164	172	-457
Randy Foye	85.4	2006-07	MIN	82	22.9	10.1	2.7	2.8	0.6	0.3	1.9	3.7	8.4	43.4	0.8	2.3	36.8	2.0	2.3	1,879	832	218	232	53	21	152	184	-165
Tony Lavelli	85.3	1949-50	BOS	56		8.8		0.7				2.9	7.8	37.2				3.0	3.5		492		40				107
Dick Garrett	85.2	1969-70	LAL	73	31.8	11.6	3.2	2.5				4.8	11.2	43.4				1.9	2.2	2,318	846	235	180				236
Darren Collison	85.1	2009-10	NOH	76	27.8	12.4	2.5	5.7	1.0	0.1	2.7	4.9	10.4	47.7	0.6	1.5	40.0	1.9	2.3	2,109	946	192	432	78	4	202	92	-175
Chauncey Billups	85.0	1997-98	TOT	80	27.7	11.2	2.4	3.9	1.3	0.1	2.2	3.5	9.4	37.4	1.3	4.1	32.9	2.8	3.3	2,216	893	190	314	107	4	174	172	-449
Keyonte George	84.8	2023-24	UTA	75	27.0	13.0	2.8	4.4	0.5	0.1	2.5	4.3	10.9	39.1	2.0	5.9	33.4	2.5	3.0	2,023	974	211	332	36	7	188	91	-374
Chris Paul	84.7	2005-06	NOK	78	36.0	16.1	5.1	7.8	2.2	0.1	2.3	5.2	12.1	43.0	0.6	2.3	28.2	5.1	6.0	2,808	1,258	400	611	175	6	183	218	-181