iSport's third-place qualifier Oliver Turvey had a terrible afternoon, losing two spots off the start and then being dealt a drivethrough penalty for moving twice to defend his position.
Scuderia Coloni lost both cars late in the race when Vladimir Arabadzhiev crashed into the tyre wall with two laps remaining and Alberto Valerio spun and stalled moments later, while Super Nova's Marcus Ericsson was forced to park at mid-distance when his engine exploded.
Vietoris had looked on course to make it a comfortable one-two for the Spanish team, only to retire with a mechanical problem, which left Razia to take an easy runner-up spot.
The Barwa Addax driver had started from the back of the grid after being found to be underweight following his fourth-place finish in the feature race, but made up 11 places in the opening laps.
ART's Sam Bird ended up 10th after being passed by d'Ambrosio, Pérez and Ho-Pin Tung in quick succession in the closing laps after suddenly dropping to around two seconds off the pace.