Racing Engineering's Norman Nato has topped the first day of the latest GP2 Series pre-season test at Jerez, ahead of countryman Pierre Gasly.
The Frenchman, who enters into his second season with the Spanish team having debuted with Arden last year, topped the timesheets in the generally faster morning session as one of only to two drivers to dip below 1min 26secs.
Hot on his heels was Gasly with GP2 debutants PREMA Racing, the Red Bull Junior fastest in the afternoon but setting his best time of the day in the morning behind Nato.
Making it two Racing Engineering drivers inside the top three, Jordan King led fellow Briton Alex Lynn in third and fourth, with top rookie Antonio Giovanazzi completing a strong day for multiple F3 champions PREMA in fifth position.
Elsewhere, Mitch Evans was sixth for the new look Campos team, ahead of title favourite Sergey Sirotkin, Arthur Pic, Oliver Rowland and Gustav Malja.
Stoppages were limited to Jimmy Eriksson having an off in the afternoon, while there was also a brief delay in the morning due to fog.
Meanwhile, just 21 of the planned 24 drivers took part as Carlin continue its search for a second driver to join Marvin Kirchhofer, while Status Grand Prix didn't participate at all.