Sauber reserve driver Raffaele Marciello will receive his fourth practice outing for the squad at next weekend's United States Grand Prix. Marciello, who participated in the opening session in Malaysia, Spain and Britain, will pilot the C34-Ferrari during first practice at the Circuit of the Americas. Marciello will replace regular driver Felipe Nasr for the session, before the Brazilian returns for the second practice run later in the day. Ferrari junior Marciello currently occupies eighth position in this year's GP2 Series.