Óscar Tunjo will taking the third entry at Jenzer Motorsport to return to the category.
[2] Charles Leclerc took his first pole position since the Red Bull Ring round with a time over three-tenths faster than his nearest rival, Hughes.
Nyck de Vries took third with a time just under half a second slower than Leclerc.
Jack Aitken took his first GP3 win in a tight battle between himself and Antonio Fuoco.
Haas F1 development driver, Santino Ferrucci achieved his first podium, 5.8 seconds adrift of the leader.