The MP Motorsport driver lined up second earlier than taking the lead at Flip 1 from polesitter Kush Maini (Campos).
He managed to construct a stable lead over second-placed Iwasa (DAMS) and though the Japanese driver started to shut after a digital security automobile, he cleared off into the space end 4.2s clear.
Iwasa had lined up fifth and made a incredible begin, leaping as much as second by Flip 2 earlier than setting about chasing Hauger.
For 5 laps within the closing phases he put in quicker laps than the Norwegian, however ultimately proved unable to launch a transfer and settled for second.
Oliver Bearman snatched third from Theo Pourchaire for his fourth podium of the season, catching the ART title contender sleeping at Flip 1 to assist Prema team-mate Frederik Vesti cling onto his championship lead.
At first, Hauger took the lead from Maini into Flip 1 because the Indian driver locked up, with Iwasa swooping into second across the outdoors of Flip 2.
Bearman, in the meantime, had a robust begin from fourth and in addition cleared Maini to run third by lap two, just for the poleman to take again third the next lap at Flip 1, braking late to move his fellow rookie as Pourchaire closed on the pair.
Hauger was 1.7s away from Iwasa by lap 4, a niche which shrunk to 1.3s by lap 12 when the VSC was deployed after contact between Clement Novalak (Trident) and Campos driver Ralph Boschung.
Ayumu Iwasa, DAMS
Photograph by: Formulation Motorsport Ltd
Novalak tried a transfer up the within of Flip 1 however made contact with the Swiss, with Boschung operating into the limitations, whereas Arthur Leclerc (DAMS) was additionally caught up within the tangle however continued.
Racing resumed on lap 13, with Pourchaire getting the bounce on Bearman to grab fourth up the within of Flip 2.
Hauger was 2.5s clear on lap 18 when Iwasa was advised he might push and put in robust lap occasions to slash the hole to only one second by lap 24 earlier than falling again once more.
Pourchaire handed Maini at Flip 1 to take third with transient contact from behind from the Campos driver, although each escaped unscathed. Bearman then squeezed by at Flip 2 for fourth, demoting Maini two positions in as many corners.
Bearman then made it previous Pourchaire with two laps remaining to steal the ultimate podium spot.
Jehan Daruvala, who lined up third for MP Motorsport however struggled along with his begin, completed fifth, having handed Maini at Flip 2 on the ultimate lap.
Victor Martins completed seventh for ART, with Isack Hadjar rounding off the points-paying positions for Hitech.
Although Vesti missed out on the factors in ninth, Bearman passing Pourchaire salvaged his lead which stands at one level heading into Sunday’s race.