The Japanese DAMS driver had taken pole on Friday, beating team-mate Roy Nissany to the punch in the dying stages of the session. Iwasa led from the off and despite briefly slipping behind second-place starter and team-mate Roy Nissany, the Red Bull and Honda junior held the lead into the opening laps.
He came under little pressure in the early stages, as Nissany had to absorb an assault from the already-crowned F2 champion Felipe Drugovich, who after clearing Theo Pourchaire early on eventually battled past the Israeli at Turn 9 on the seventh lap of the race.
