Zak O’Sullivan claimed his first Feature Race win in a closely-fought battle around the Red Bull Ring. As many as four different drivers held the lead at various stages but it was the PREMA Racing man that kept his foes at bay in the end.Trident’s Gabriel Bortoleto picked up vital Championship points with his P2 finish to strengthen his lead to 36 points, while Caio Collet made it back-to-back P3 finishes for Van Amersfoort Racing.AS IT HAPPENEDGrégoire Saucy held onto pole from lights out while Bortoleto had to fend off pressure from Paul Aron to keep hold of third. Further back,…