LMP1 points leaders Timo Bernhard and Brendon Hartley will start the Mexico round of the World Endurance Championship from pole position, as Porsche claimed a front-row lockout at the Autodromo Hermanos Rodriguez.
With team-mate Earl Bamber watching on from the garage, Bernhard and Hartley set an average time of 1:24.564s to secure the #2 919 Hybrid's first pole of the campaign.
Nick Tandy and Andre Lotterer finished 0.148 seconds off the pace in the sister Porsche, confirming the German manufacturer's first qualifying one-two since last year's 24 Hours of Le Mans.
Toyota's TS050 Hybrids will start third and fourth, with the #7 car coming close to splitting the 919s during the 20-minute session.
Mike Conway's initial lap was a tenth of a second quicker than Tandy's run, but Jose Maria Lopez fell two tenths short of Lotterer's marker, handing Porsche the edge on average.
Lopez went out for a last-ditch run in the final two minutes, but by that point light rain had started to pepper the 2.6-mile circuit, thus preventing an improvement from the three-time touring car world champion.
The sister Toyota qualified eight tenths off the overall pace.
In LMP2, Andre Negrao and Nicolas Lapierre gave Signatech Alpine its first pole position start of 2017.
Driving the Alpine A470-Gibson shared with Gustavo Menezes, the pair registered an average of 1:32.809s – three tenths better than the second-placed #38 Jackie Chan DC Racing ORECA.
Vaillante Rebellion's #31 squad submitted the third-quickest time, ahead of the G-Drive Racing crew which had claimed three out of four WEC poles prior to the Mexico round.
Pole position in GTE-Pro went to the AF Corse Ferrari squad for the second time this season.
Davide Rigon and Sam Bird combined to form an average of 1:39.425s, nudging out the Aston Martin of Nicki Thiim and Marco Sorensen by a tenth.
The pair of Ford GTs held a provisional one-two after the first set of runs, but a resurgent run from Bird helped push the Ferrari ahead after Rigon locked up at turn four.
Aston Martin reverted to its initial drivers near the end of the session in a late bid to change the order, but Sorensen was unable to meet the target time.
The British marque also lost out marginally in GTE-Am, as Abu Dhabi Proton Racing’s Christian Ried and Matteo Cairoli ended Pedro Lamy and Paul Dalla Lana’s 100% pole rate in 2017.
Round five of the World Endurance Championship gets underway on Sunday, August 3rd at 12:00 local time (18:00 UK).
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