Taylor and teammate Helio Castroneves completed 35 laps in the #7 Acura ARX-05, the best of which was a 1min13.601sec, beating Montoya’s best by 0.488sec. JPM in turn was more than half a second up on the Acuras’ nearest rival, the Action Express racing Cadillac DPi-V.R of Filipe Albuquerque.

Fastest of the Global P2s was the JDC-Miller Motorsports Oreca piloted by Simon Trummer who was a mere 0.01sec quicker than the second AXR Cadillac driven by Felipe Nasr, and a tenth faster than Wayne Taylor Racing’s Cadillac.

Jonathan Bomarito was top Mazda driver with a 1min15.293 in the car he will share this weekend with IndyCar fulltimer Spencer Pigot.

The two ESM Nissans of Ryan Dalziel and Pipo Derani were eighth and tenth, separated by Stephen Simpson in the second JDC-Miller machine.

In GTLM, Bamber’s #912 Porsche was 0.3sec quicker than Jan Magnussen’s best effort in the #3 Corvette C7.R, while Jesse Krohn was third in the BMW M8. Patrick Pilet clocked P4 in the second Porsche ahead iof the fastest Ford GT, that of Joey Hand, and the second Corvette driven by Tommy Milner.

GT Daytona cars made a strong impression, with the Turner BMW M6 driven by popular veteran Bill Auberlen finishing up top, beaten by only three GTLM cars. His best effort, a 1min20.803 was a mere one-tenth slower than Krohn’s best in the works M8, and Lawson Aschenbach was also within the same tenth driving the Michael Shank Racing #93 Acura NSX.

Third and fourth in GTD were the two Lexus RC Fs of Jack Hawksworth and Dominik Baumann, ahead Bryan Sellers in Paul Miller Racing’s Lamborghini Huracan and Alessandro Balzan in the Scuderia Corsa Ferrari 488.

Second practice gets underway at 3pm local (Eastern) time.

IMSA Mid-Ohio, first practice

Pos.	#	Driver	Class	Chassis	Time	Gap
1	7	Helio Castroneves Ricky Taylor	P	Acura DPi	1'13.601
2	6	Juan Pablo Montoya Dane Cameron	P	Acura DPi	1'14.089	0.488
3	5	Filipe Albuquerque Joao Barbosa	P	Cadillac DPi	1'14.608	1.007
4	85	Simon Trummer Robert Alon	P	ORECA LMP2	1'14.740	1.139
5	31	Eric Curran Felipe Nasr	P	Cadillac DPi	1'14.741	1.140
6	10	Jordan Taylor Renger van der Zande	P	Cadillac DPi	1'14.865	1.264
7	55	Spencer Pigot Jonathan Bomarito	P	Mazda DPi	1'15.293	1.692
8	2	Scott Sharp Ryan Dalziel	P	Nissan DPi	1'15.338	1.737
9	99	Mikhail Goikhberg Stephen Simpson	P	ORECA LMP2	1'15.383	1.782
10	22	Pipo Derani Johannes van Overbeek	P	Nissan DPi	1'15.425	1.824
11	54	Jon Bennett Colin Braun	P	ORECA LMP2	1'16.068	2.467
12	77	Oliver Jarvis Tristan Nunez	P	Mazda DPi	1'16.580	2.979
13	52	Gustavo Yacaman Sebastian Saavedra	P	Ligier LMP2	1'17.243	3.642
14	38	James French Kyle Masson	P	ORECA LMP2	1'17.884	4.283
15	912	Earl Bamber Laurens Vanthoor	GTLM	Porsche 911 RSR	1'20.148	6.547
16	3	Jan Magnussen Antonio Garcia	GTLM	Corvette C7.R	1'20.467	6.866
17	24	John Edwards Jesse Krohn	GTLM	BMW M8 GTE	1'20.704	7.103
18	96	Bill Auberlen Dillon Machavern	GTD	BMW M6 GT3	1'20.803	7.202
19	93	Justin Marks Lawson Aschenbach	GTD	Acura NSX GT3	1'20.827	7.226
20	911	Nick Tandy Patrick Pilet	GTLM	Porsche 911 RSR	1'20.897	7.296
21	66	Joey Hand Dirk Müller	GTLM	Ford GT	1'21.104	7.503
22	4	Oliver Gavin Tommy Milner	GTLM	Corvette C7.R	1'21.118	7.517
23	67	Ryan Briscoe Richard Westbrook	GTLM	Ford GT	1'21.192	7.591
24	15	David Heinemeier Hansson Jack Hawksworth	GTD	Lexus RC F GT3	1'21.256	7.655
25	14	Kyle Marcelli Dominik Baumann	GTD	Lexus RC F GT3	1'21.259	7.658
26	25	Connor de Phillippi Alexander Sims	GTLM	BMW M8 GTE	1'21.424	7.823
27	48	Bryan Sellers Madison Snow	GTD	Lamborghini Huracan GT3	1'21.468	7.867
28	63	Cooper MacNeil Alessandro Balzan	GTD	Ferrari 488 GT3	1'21.671	8.070
29	86	Alvaro Parente Katherine Legge	GTD	Acura NSX GT3	1'21.813	8.212
30	16	Wolf Henzler Michael Schein	GTD	Porsche 911 GT3 R	1'22.004	8.403
31	58	Patrick Long Christina Nielsen	GTD	Porsche 911 GT3 R	1'22.160	8.559
32	75	Kenny Habul Maro Engel	GTD	Mercedes-AMG GT3	1'22.209	8.608
33	44	Andy Lally John Potter	GTD	Audi R8 LMS GT3	1'22.319	8.718
34	33	Jeroen Bleekemolen Ben Keating	GTD	Mercedes-AMG GT3	1'22.604	9.003