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.
