Whilst frustrated to lose out on victory, a maiden podium for Martinez left him more than satisfied, while Barba finished a distant third as he suffered problems in his Prema Powerteam car during the latter stages.
Outside the top three, things behind were a little more frenetic. Having first held off the advances of his Ultimate Signature team-mate Esteban Guerrieri early on, Carbone then came under pressure form Giedo van der Garde all the way to the chequered flag. Nonetheless, fourth place still marks his and the team's best result since entering the World Series.
van der Garde eked out his championship lead further in fifth place, the P1 Motorsport driver safe in the knowledge that closest rivals Mikhail Aleshin and Charles Pic failed to score, the former retiring when his rear-wing flew off down the Hangar Straight and the latter finishing down in 15th.
Guillaume Moreau shadowed van der Garde throughout the race but had to make do with sixth for KTR, ahead of Bertrand Baguette and Julien Jousse, the Frenchman fighting his way up from 14th on the grid.
Marco Bonanomi was ninth for Comtec, ahead of Robert Wickens, who scraped the final point in tenth after going off whilst running sixth on lap 18.
Elsewhere, James Walker was not quite able to do enough to get into the points after battling his way up from 18th to 11th, but Duncan Tappy showed well to finish 16th on his debut in race that saw just three retirements. Pippa Mann finished 19th.