Dragon Racing driver Jose Maria Lopez set the fastest time across the two free practice sessions for ABB FIA Formula E's second visit to Santiago.
Scorching temperatures are set to be a key factor in the outcome of the race, which takes place on a new 1.45-mile track set entirely within the city's O'Higgins Park.
When FP1 got underway at 8am, the temperature was already at 24.5C. Audi's Lucas di Grassi topped that session, which was disrupted by a big crash for Nissan e.dams driver Sebastien Buemi, with a best time of 1m08.630s
Virgin Racing pair Sam Bird and Robin Frijns each took a turn at the top during the shorter 30-minute second session - during which temperatures peaked at 28.4C - with the latter holding the benchmark time for much of FP2.
But during a string of fastest laps set on full power late on during the session, Lopez rose to the top of the times with a 1m08.194s.
He looked set to improve again with his final lap of FP2, setting fastest sectors in the opening two thirds of the track before fading in the final sector.
Frijns ended up second with his best full power effort - a 1m08.260s - coming during the flurry of fast times.
Di Grassi put himself third late on to split the Virgin drivers, with Bird ending up fourth as a result.
Pascal Wehrlein, who grappled with a sliding car throughout much of the early running, was fifth for Mahindra Racing.
Jaguar's Mitch Evans twice brushed the barrier at the exit of the Turn 12 left-hander, but did not cause visible damage to his machine and ended up sixth.
Championship leader Jerome d'Ambrosio was seventh in FP2 ahead of Alexander Sims, Oliver Rowland and Antonio Felix da Costa in the second BMW Andretti car.
Daniel Abt finished 11th ahead of DS Techeetah pair Jean-Eric Vergne, who locked up at the final hairpin midway through the second session, and Andre Lotterer.
Lotterer glanced the wall on the exit of the tight Turn 7 right-hander, which feeds onto the long curved section of the track, in the final 10 minutes of FP2 but was able to continue.
Buemi hit the track at the beginning of FP2 despite missing much of the first session following his heavy crash at Turn 7 during FP1.
The 2015/16 FE champions locked up heavily on the approach to the corner and struck the inside wall with his right-front, which sent him careering into the barriers on the outside with major damage to the right side of his car - causing a lengthy red-flag delay.
But Buemi's machine was fixed in time for him to go out and set the 15h best time in FP2.
Venturi's Felipe Massa was another driver to struggle with the handling of his car and experienced off-track moments at Turn 12 and the final corner on his way to 16th in FP2, just ahead of Nelson Piquet Jr (Jaguar) and HWA racer Stoffel Vandoorne.
|1||Lucas di Grassi||Audi||Audi||1m08.630s||-||25|
|5||Jean-Eric Vergne||DS Techeetah||DS||1m09.135s||0.505s||29|
|6||Antonio Felix da Costa||BMW||BMW||1m09.475s||0.845s||27|
|8||Andre Lotterer||DS Techeetah||DS||1m09.528s||0.898s||28|
|16||Nelson Piquet Jr.||Jaguar||Jaguar||1m09.991s||1.361s||23|
|17||Jose Maria Lopez||Dragon||Penske||1m10.017s||1.387s||26|
|1||Jose Maria Lopez||Dragon||Penske||1m08.194s||-||19|
|3||Lucas di Grassi||Audi||Audi||1m08.299s||0.105s||16|
|10||Antonio Felix da Costa||BMW||BMW||1m08.755s||0.561s||13|
|13||Jean-Eric Vergne||DS Techeetah||DS||1m08.833s||0.639s||14|
|14||Andre Lotterer||DS Techeetah||DS||1m08.856s||0.662s||18|
|17||Nelson Piquet Jr.||Jaguar||Jaguar||1m08.921s||0.727s||16|