FIA European F3 champion Raffaele Marciello topped the morning session of day one of Formula Renault 3.5 post-season testing at Motorland Aragon.
The young Italian took over at the top of the timesheets from fellow rookie Luca Ghiotto with two hours to go and remained in first until the checkered flag.
Lotus junior Esteban Ocon took second in his first collective test in the championship, while Sauber F1 hopeful Sergey Sirotkin rounded out the top three for Fortec.
Oliver Rowland, also testing with Fortec, was fourth while 3.5 regular Zoel Amberg rounded out the top five.
Malaysian racer Jazeman Jaafar, who spent the 3.5 season with Carlin, took sixth with Tech 1. Eurocup graduate Matthieu Vaxiviere began his two-day stint at Pons with seventh, while another 2.0 racer Jake Dennis took eighth.
Strakka regular Matias Laine and Ghiotto, whose session was interrupted by an off in the final hour, completed the top ten.
|1||Raffaele Marciello||P1 by Strakka Racing||1:40.354||?||44|
|3||Sergey Sirotkin||Fortec Motorsports||1:40.752||0.398||38|
|4||Oliver Rowland||Fortec Motorsports||1:40.846||0.492||50|
|6||Jazeman Jaafar||Tech 1 Racing||1:41.040||0.686||46|
|7||Matthieu Vaxiviere||Pons Racing||1:41.147||0.793||33|
|8||Jake Dennis||SMP Racing by Comtec||1:41.342||0.988||42|
|9||Matias Laine||P1 by Strakka Racing||1:41.405||1.051||39|
|10||Luca Ghiotto||Pons Racing||1:41.482||1.128||27|
|12||Pierre Gasly||Tech 1 Racing||1:41.660||1.306||35|
|13||Pietro Fantin||International Draco Racing||1:41.855||1.501||33|
|14||William Buller||Arden Caterham||1:41.878||1.524||20|
|16||Antonio Fuoco||AV Formula||1:41.994||1.640||36|
|17||Riccardo Agostini||AV Formula||1:42.053||1.699||34|
|19||Dennis Olsen||SMP Racing by Comtec||1:42.380||2.026||31|
|21||Roman Mavlanov||Zeta Corse||1:43.117||2.763||37|
|23||Jack Aitken||Arden Caterham||1:43.379||3.025||30|
|24||Mirko Bortolotti||International Draco Racing||1:44.171||3.817||25|
|25||Sandy Stuvik||Zeta Corse||1:44.252||3.898||20|