CLICK HERE for full WEC practice results
Audi has kicked off the second-half of the 2015 World Endurance Championship out front, with the #7 Audi of Marcel Fassler, Benoit Treluyer and Andre Lotterer topping the timesheets in both Friday practice sessions.
The first track action for the WEC competitiors since June's Le Mans 24 Hours, championship leaders Fassler, Treluyer and Lotterer hit the ground running at Audi's home circuit in the #7 R18 e-tron, albeit chased hard by arch rivals Porsche.
Keen to turn its focus to the WEC title after achieving his primary objective of Le Mans glory, the #17 919 Hybrid headed up the sister #18 car, both just a tenth off the pace-setting Audi trio.
With its eyes firmly trained on 2016 now, the summer break hasn't seemingly given time for defending champions Toyota to mount a comeback challenge, with both its cars three seconds off the pace.
In the LMP2 class, the G-Drive Ligiers led the way with both of its JS P2s, with Strakka Racing – on its first competitive outing since switching the Gibson chassis – ending the day third.
In the GTE classes, the Aston Martin of Richie Stanaway, Alex MacDowell and Fernando Rees led the Pro class, with the SMP Ferrari heading up the Am class.