Richie Stanaway was fastest on the opening day of Formula Renault 3.5 testing at Aragon in Spain.
The New Zealander was quickest in the morning and afternoon sessions for the Gravity-Charouz Racing team, concluding the day 0.122s faster than Formula Renault Eurocup graduate Danil Kvyat, who was driving for P1 Motorsport.
Stanaway, the German F3 champion, was one of 24 drivers invited to take part in the morning test by Renault Sport Technologies, and set the early place with a time of 1m43.594s on a chilly morning at the Motorland circuit.
He then improved his pace by over four tenths during the afternoon as the track gradually began to dry and finished with a benchmark time of 1m43.191.
Daniel Zampieri was third quickest for BVM Target while Formula Renault Eurocup champion Robin Frijns, second in the morning session, fell to fourth in the afternoon for Comtec.
Carlos Sainz Jr, who will driver for Carlin in British F3 next year, was fifth quickest for the team, ahead of Marco Sorenson (Gravity-Charouz), Will Stevens (Tech 1) and Carlos Huertas (Fortec).
GP3 racer Nico Muller was ninth quickest for Comtec, while Japanese F3 champion Yuhi Sekiguchi rounded out the top 10 for BVM Target.
Daniel Abt, who topped the timesheets on both days in last week's GP3 test in Valencia was 11th quickest while Alex Lynn, the Formula Renault UK champion, was 16th for Fortec.
Day One times:
Pos Driver Team Time Gap 1. Richie Stanaway Gravity-Charouz 1m43.191s 2. Danil Kvyat P1 1m43.313s + 0.122s 3. Daniel Zampieri BVM Target 1m43.477s + 0.286s 4. Robin Frijns Comtec 1m43.663s + 0.472s 5. Carlos Sainz Jr Carlin 1m43.741s + 0.550s 6. Marco Sorenson Gravity-Charouz 1m43.820s + 0.629s 7. Will Stevens Tech 1 1m43.821s + 0.630s 8. Carlos Huertas Fortec 1m43.959s + 0.768s 9. Nico Muller Comtec 1m44.023s + 0.832s 10. Yuhi Sekiguchi BVM Target 1m44.032s + 0.841s 11. Daniel Abt Pons 1m44.201s + 1.010s 12. Daniel Juncadella Pons 1m44.223s + 1.032s 13. Raffaele Marciello Comtec 1m44.288s + 1.197s 14. Jazeman Jaafar KMP/Carlin 1m44.375s + 1.208s 15. Lucas Foresti Tech 1 1m44.399s + 1.894s 16. Alex Lynn Fortec 1m44.463s + 1.272s 17. David Fumanelli Draco 1m44.524s + 1.333s 18. Laurens Vanthoor ISR 1m44.531s + 1.340s 19. Nigel Melker P1 1m44.613s + 1.422s 20. Felipe Nasr Epic 1m44.862s + 1.671s 21. Stoffel Vandoorne KPM 1m44.898s + 1.707s 22. Sergio Campana BVM Target 1m44.970s + 1.779s 23. Alex Fontana ISR 1m44.981s + 1.900s 24. Fabio Gamberini ISR 1m45.074s + 1.883s 25. Alex Riberas Tech 1 1m45.106s + 2.105s 26. Javier Tarancon KMP 1m45.250s + 2.128s 27. Adrien Tambay KMP 1m45.332s + 2.141s 28. Yann Cunha Carlin 1m45.425s + 2.234s 29. Fabiano Machado Epic 1m45.828s + 2.637s 30. Andrea Roda Draco 1m46.082s + 2.891s 31. Yann Zimmer Draco 1m46.184s + 2.992s 32. Walter Grubmuller P1 No time