Garcia’s time, like Dirk Muller’s top time from this morning, was in the 50.9sec bracket – but just 0.062sec faster than Hand’s #66 Ford GT around the 1.5-mile seven-turn track, both cars completing 46 laps.

Behind them, by just a tenth, was the #912 Porsche 911 RSR of Laurens Vanthoor, while Richard Westbrook (Ford) and Nick Tandy (Porsche) were just 0.003sec apart and within a quarter second of Garcia’s best.

The BMW M8s of John Edwards and Alexander Sims were sixth and seventh, beating the second Corvette of Tommy Milner who was 0.59sec behind his teammate Garcia.

Magnus Racing put 59 laps on its Audi R8, more than any other team, and snagged top time in GTD, 0.15sec ahead of Cooper MacNeil’s Scuderia Corsa Ferrari 488, and more than three-tenths faster than the Lexus RC F of Dominik Baumann.

The top five was completed by Patrick Long in the Wright Motorsports Porsche 911 GT3 and the Riley Mercedes AMG GT of Jeroen Bleekemolen, as the Acura NSXs slipped to sixth and seventh.

Third practice begins at 4.55pm local (Eastern) time.

Cla	Num	Driver	Class	Chassis	Laps	Time	Gap	Interval	km/h
1	3	Jan Magnussen    Antonio Garcia	GTLM	Corvette C7.R	46	50.939			104.172
2	66	Joey Hand    Dirk Müller	GTLM	Ford GT	46	51.001	0.062	0.062	104.045
3	912	Earl Bamber    Laurens Vanthoor	GTLM	Porsche 911 RSR	55	51.118	0.179	0.117	103.807
4	67	Ryan Briscoe    Richard Westbrook	GTLM	Ford GT	32	51.145	0.206	0.027	103.752
5	911	Nick Tandy    Patrick Pilet	GTLM	Porsche 911 RSR	59	51.148	0.209	0.003	103.746
6	24	John Edwards    Jesse Krohn	GTLM	BMW M8 GTE	43	51.277	0.338	0.129	103.485
7	25	Connor de Phillippi    Alexander Sims	GTLM	BMW M8 GTE	19	51.321	0.382	0.044	103.396
8	4	Oliver Gavin    Tommy Milner	GTLM	Corvette C7.R	43	51.529	0.590	0.208	102.979
9	44	Andy Lally    John Potter	GTD	Audi R8 LMS GT3	59	52.140	1.201	0.611	101.772
10	63	Cooper MacNeil    Gunnar Jeannette	GTD	Ferrari 488 GT3	47	52.298	1.359	0.158	101.465
11	14	Kyle Marcelli    Dominik Baumann	GTD	Lexus RC F GT3	27	52.468	1.529	0.170	101.136
12	58	Patrick Long    Christina Nielsen	GTD	Porsche 911 GT3 R	57	52.570	1.631	0.102	100.940
13	33	Jeroen Bleekemolen    Ben Keating	GTD	Mercedes-AMG GT3	40	52.578	1.639	0.008	100.924
14	86	Alvaro Parente    Katherine Legge	GTD	Acura NSX GT3	52	52.823	1.884	0.245	100.456
15	93	Justin Marks    Lawson Aschenbach	GTD	Acura NSX GT3	49	52.831	1.892	0.008	100.441
16	96	Bill Auberlen    Robby Foley	GTD	BMW M6 GT3	47	52.850	1.911	0.019	100.405
17	15	Jack Hawksworth    Mario Farnbacher	GTD	Lexus RC F GT3	33	53.005	2.066	0.155	100.111
18	48	Bryan Sellers    Madison Snow	GTD	Lamborghini Huracan GT3	0