Defending World Cup winner Marciello led the 12-lap race all through in his Staff Landgraf Mercedes-AMG GT3, staving off a stern problem from model stablemate Maro Engel.
Edoardo Mortara accomplished the rostrum in his Audi R8 LMS GT3, having been handed by Engel on the run right down to Lisboa in the beginning of the race.
Poleman Marciello managed to take care of his benefit on the opening lap, however the security automobile was quickly deployed when Porsche pair Thomas Preining and Matteo Cairoli each got here to a halt at San Francisco.
The race resumed on lap 5 with Marciello main Engel, Mortara and Daniel Juncadella, who tried to problem Mortara heading right down to Lisboa in a bid to make it a Mercedes 1-2-3.
However the transfer backfired and Juncadella was squeezed into the wall, and though he managed to proceed he slipped to ninth place.
Out entrance, Marciello had stretched out a slender benefit of seven tenths of a second when Audi driver Adderly Fong suffered an enormous crash at Mandarin on lap eight, bringing out the protection automobile a second time.
The race was then suspended whereas marshals repaired the barrier, with motion solely resuming 23 minutes later for a two-lap shootout.
Marciello managed to fend off Engel for the essential run to Lisboa on the restart, and pulled away to the tune of 1.172s to assert victory and provides himself pole for Sunday’s fundamental occasion.
Mortara held on to 3rd forward of Augusto Farfus in the perfect of the BMW M4 GT3s.
Sheldon van der Linde made it two BMW drivers within the prime 5 when he handed the Ferrari 296 GT3 of Daniel Serra approaching Lisboa on the last restart, which was the one change of place within the prime 10 after the crimson flag.
Behind Serra, Laurens Vanthoor was a low-key seventh for Porsche, having slipped from fourth on the grid after being nudged out huge at Lisboa on the preliminary begin.
Christopher Haase (Audi), Juncadella and Earl Bamber (Porsche) rounded out the highest 10.
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