Raffaele Marciello claimed his maiden GP2 Series win for Racing Engineering at Spa after overtaking longtime leader Stoffel Vandoorne late in the race.
Johnny Cecotto Jr. will start Saturday's feature race from pole position, while championship leader Jolyon Palmer will join him on the front row in Austria.
Rio Haryanto proved quickest of anyone on day 2 of the GP2 post-season testing in Abu Dhabi, while the GP3 timesheets were headed by British driver Oliver Rowland.