Porsche topped the time charts in opening practice for Sunday’s FIA WEC season-ending Six Hours of Sao Paulo, in a dominant 1-2 performance.

The No. 20 Porsche 919 Hybrid of Brendon Hartley reeled off a best lap of 1:19.172 in the 90-minute session, outpacing teammate Romain Dumas in the No. 14 entry by 0.339 seconds.

Audi’s Lucas di Grassi was third, ahead of both Toyota TS040 Hybrids, which ended the session in an uncharacteristic 4th and 6th overall.

G-Drive Racing led the way in LMP2, thanks to Olivier Pla’s 1:25.670 in the Ligier JS P2 Nissan.

The production-based ranks were topped by AF Corse (GTE-Pro) and Aston Martin Racing (GTE-Am).

The second and final Free Practice of the day is on tap for 5:30 p.m. local.

RESULTS: Free Practice 1