Antonio Fuoco set a best time of 1m35.649s at the end of the 90-minute session in the #50 Ferrari 499P LMH, a massive 2.6 seconds up on the sister #51 machine as the track rapidly improved late on.
Best of the rest in third was the #94 Peugeot 9X8, followed by the two works Penske Porsche 963s in fourth and fifth, while home favourite Toyota was sixth and seventh with its two GR010 HYBRIDs.
Despite the looming threat of Typhoon Yun-yeung, Friday morning's 90-minute session started on schedule at 11am local time in wet conditions and passed largely without incident.
Almost every Hypercar class manufacturer enjoyed a stint at the top of the times, as the track steadily dried out.
Ferrari took command of the times with a little over 30 minutes to go as James Calado went quickest in the #51 car, with team-mate Antonio Giovinazzi becoming the first driver to breach the 1m40s mark when he set a 1m39.198s with 22 minutes left on the clock.
Fuoco then traded the top time with Giovinazzi as he took over at the wheel of the #50 Ferrari, with Porsche man Michael Christensen briefly snatching the advantage before Fuoco went faster again, posting a 1m37.616s and then a 1m35.649s after switching to slick tyres.
Giovinazzi set the best time in the #51 car of 1m38.258s on wets, just over four tenths up on late improver Gustavo Menezes in the #94 Peugeot.
Christensen's time was eclipsed late on by his opposite number in the sister #6 Porsche, Laurens Vanthoor, who posted a 1m38.729s to go fourth-fastest.
Mike Conway set the best time for Toyota of 1m39.251s in the #7 car, four hundredths quicker than Brendon Hartley in the #8 car in a subdued opening session for the Japanese manufacturer.
Completing the top 10 were the second of the Peugeots, the #93 car in which Paul di Resta set the best time, the solo Cadillac V-Series.R of Alex Lynn and the Proton Competition customer Porsche of Harry Tincknell.
The JOTA Porsche enjoyed a lengthy spell at the top of the times in the opening half of the session when conditions were at their worst, but ended up 11th in the Hypercar class and slower than the team's LMP2 car, which topped that class.
Oliver Rasmussen put in a late flyer of 1m40.781s aboard the #28 ORECA 07 to take the top spot in LMP2, almost two seconds up on nearest rival Filip Ugran in the #9 Prema machine.
United Autosports was third in class courtesy of a late effort from Ben Hanley - standing in for Tom Blomqvist this weekend - in the #23 entry.
Topping the times by an even wider margin in GTE Am was the #77 Dempsey Proton Porsche 911 RSR-19 of Mikkel Pedersen on a 1m43.538s.
That was almost four seconds up on Davide Rigon, who went second-fastest in the #54 AF Corse Ferrari 488 GTE.
A sole full-course yellow was called at the one-hour mark, but this was purely procedural rather than in response to any accident.
FP2 is scheduled to begin at 3.30pm local time, but more rain is forecast for later in the day, casting doubt on whether the session will run as planned.
Fuji WEC - First practice results:
Pos. | No. | Drivers | Car | Class | time | gap |
---|---|---|---|---|---|---|
1 | 50 |
Antonio Fuoco Miguel Molina Nicklas Nielsen |
Ferrari 499P | HYPERCAR | 1'35.649 | |
2 | 51 |
Alessandro Pier Guidi James Calado Antonio Giovinazzi |
Ferrari 499P | HYPERCAR | 1'38.258 | 2.609 |
3 | 94 |
Loïc Duval Gustavo Menezes Stoffel Vandoorne |
Peugeot 9X8 | HYPERCAR | 1'38.693 | 3.044 |
4 | 6 |
Kevin Estre Andre Lotterer Laurens Vanthoor |
Porsche 963 | HYPERCAR | 1'38.729 | 3.080 |
5 | 5 |
Dane Cameron Michael Christensen Frédéric Makowiecki |
Porsche 963 | HYPERCAR | 1'38.876 | 3.227 |
6 | 7 |
Mike Conway Kamui Kobayashi Jose Maria Lopez |
Toyota GR010 - Hybrid | HYPERCAR | 1'39.251 | 3.602 |
7 | 8 |
Sebastien Buemi Brendon Hartley Ryo Hirakawa |
Toyota GR010 - Hybrid | HYPERCAR | 1'39.291 | 3.642 |
8 | 93 |
Paul di Resta Mikkel Jensen Jean-Eric Vergne |
Peugeot 9X8 | HYPERCAR | 1'39.309 | 3.660 |
9 | 2 |
Earl Bamber Alex Lynn Richard Westbrook |
Cadillac V-Series.R | HYPERCAR | 1'39.584 | 3.935 |
10 | 99 |
Neel Jani Gianmaria Bruni Harry Tincknell |
Porsche 963 | HYPERCAR | 1'40.085 | 4.436 |
11 | 28 |
David Heinemeier Hansson Pietro Fittipaldi Oliver Rasmussen |
Oreca 07 | LMP2 | 1'40.781 | 5.132 |
12 | 38 |
Antonio Felix da Costa Will Stevens Ye Yifei |
Porsche 963 | HYPERCAR | 1'40.953 | 5.304 |
13 | 4 |
Esteban Guerrieri Tristan Vautier Joao Paulo de Oliveira |
Vanwall Vandervell 680 | HYPERCAR | 1'41.483 | 5.834 |
14 | 9 |
Filip Ugran Bent Viscaal Juan Manuel Correa |
Oreca 07 | LMP2 | 1'42.661 | 7.012 |
15 | 23 |
Josh Pierson Ben Hanley Oliver Jarvis |
Oreca 07 | LMP2 | 1'42.924 | 7.275 |
16 | 10 |
Ryan Cullen Matthias Kaiser Gabriel Aubry |
Oreca 07 | LMP2 | 1'42.984 | 7.335 |
17 | 34 |
Jakub Smiechowski Fabio Scherer Albert Costa |
Oreca 07 | LMP2 | 1'43.204 | 7.555 |
18 | 36 |
Matthieu Vaxivière Julien Canal Charles Milesi |
Oreca 07 | LMP2 | 1'43.218 | 7.569 |
19 | 22 |
Frederick Lubin Philip Hanson Filipe Albuquerque |
Oreca 07 | LMP2 | 1'43.230 | 7.581 |
20 | 31 |
Sean Gelael Ferdinand Habsburg Robin Frijns |
Oreca 07 | LMP2 | 1'43.403 | 7.754 |
21 | 41 |
Rui Andrade Robert Kubica Louis Deletraz |
Oreca 07 | LMP2 | 1'43.490 | 7.841 |
22 | 77 |
Christian Ried Mikkel Pedersen Julien Andlauer |
Porsche 911 RSR - 19 | LMGTE AM | 1'43.538 | 7.889 |
23 | 63 |
Doriane Pin Andrea Caldarelli Daniil Kvyat |
Oreca 07 | LMP2 | 1'44.139 | 8.490 |
24 | 35 |
André Negrão Memo Rojas Olli Caldwell |
Oreca 07 | LMP2 | 1'44.816 | 9.167 |
25 | 54 |
Thomas Flohr Francesco Castellacci Davide Rigon |
Ferrari 488 GTE EVO | LMGTE AM | 1'47.198 | 11.549 |
26 | 56 |
PJ Hyett Gunnar Jeannette Matteo Cairoli |
Porsche 911 RSR - 19 | LMGTE AM | 1'47.230 | 11.581 |
27 | 83 |
Luis Perez Companc Lilou Wadoux Alessio Rovera |
Ferrari 488 GTE EVO | LMGTE AM | 1'47.250 | 11.601 |
28 | 777 |
Satoshi Hoshino Casper Stevenson Tomonobu Fujii |
Aston Martin Vantage AMR | LMGTE AM | 1'47.493 | 11.844 |
29 | 98 |
Ian James Daniel Mancinelli Alex Riberas |
Aston Martin Vantage AMR | LMGTE AM | 1'47.913 | 12.264 |
30 | 21 |
Hiroshi Koizumi Simon Mann Kei Cozzolino |
Ferrari 488 GTE EVO | LMGTE AM | 1'48.414 | 12.765 |
31 | 60 |
Claudio Schiavoni Matteo Cressoni Alessio Picariello |
Porsche 911 RSR - 19 | LMGTE AM | 1'49.060 | 13.411 |
32 | 86 |
Michael Wainwright Riccardo Pera Ben Barker |
Porsche 911 RSR - 19 | LMGTE AM | 1'49.199 | 13.550 |
33 | 85 |
Sarah Bovy Michelle Gatting Rahel Frey |
Porsche 911 RSR - 19 | LMGTE AM | 1'49.455 | 13.806 |
34 | 57 |
Takeshi Kimura Scott Huffaker Ritomo Miyata |
Ferrari 488 GTE EVO | LMGTE AM | 1'49.706 | 14.057 |
35 | 33 |
Ben Keating Nicolas Varrone Nicky Catsburg |
Chevrolet Corvette C8.R | LMGTE AM | 1'50.043 | 14.394 |
36 | 25 |
Ahmad Al Harthy Michael Dinan Charlie Eastwood |
Aston Martin Vantage AMR | LMGTE AM | 1'53.388 | 17.739 |