Auto GP champion Vittorio Ghirelli announced his return to the series with the fastest time in Friday practice at the Hungaroring.
The Italian is racing in Indy Lights this season, but has rejoined his Auto GP squad Super Nova to race its third car in Hungary this weekend.
Ghirelli played himself back in with fourth in the morning session, which was topped by his team-mate Markus Pommer.
The Super Nova duo then swapped the top spot in afternoon practice, with Ghirelli coming out fastest on a 1m34.436s.
Euronova driver Kimiya Sato then got between the two Super Nova cars to take second, 0.253 seconds down on Ghirelli.
Gianluca Roda and crowd favourite Tamas Pal Kiss completed the top five. The latter had been second fastest on home turf in the morning, between Pommer and Sato.
Practice 1 Pos Driver Team Time Gap Laps 1. Markus Pommer Super Nova 1m35.755s 13 2. Tamas Pal Kiss Zele 1m35.865s +0.110s 15 3. Kimiya Sato Euronova 1m36.269s +0.514s 12 4. Vittorio Ghirelli Super Nova 1m36.402s +0.647s 15 5. Michela Cerruti Super Nova 1m37.064s +1.309s 14 6. Andrea Roda Virtuosi 1m37.137s +1.382s 14 7. Loris Spinelli Eurotech 1m37.937s +2.182s 14 8. Kevin Giovesi Eurotech 1m38.046s +2.291s 9 9. Yoshitaka Kuroda Zele 1m38.558s +2.803s 14 10. Michele La Rosa MLR 71 1m38.705s +2.950s 11 11. Giuseppe Cipriani Ibiza 1m38.735s +2.980s 15 Practice 2 Pos Driver Team Time Gap Laps 1. Vittorio Ghirelli Super Nova 1m34.436s 14 2. Kimiya Sato Euronov 1m34.689s +0.253s 15 3. Markus Pommer Super Nova 1m34.816s +0.380s 14 4. Andrea Roda Virtuosi 1m34.898s +0.462s 16 5. Tamas Pal Kiss Zele 1m35.058s +0.622s 13 6. Michela Cerruti Super Nova 1m35.569s +1.133s 14 7. Yoshitaka Kuroda Zele 1m35.966s +1.530s 14 8. Loris Spinelli Eurotech 1m36.380s +1.944s 12 9. Kevin Giovesi Eurotech 1m36.606s +2.170s 11 10. Giuseppe Cipriani Ibiza 1m36.888s +2.452s 16 11. Michele La Rosa MLR 71 1m37.409s +2.973s 14 12. Sam Dejonghe Virtuosi 1m37.793s +3.357s 4