Trident's Antonio Fuoco beat the GP3 field by half a second in the final day of testing at Estoril.
After topping both sessions yesterday, Fuoco proved to be unbeatable in the final day as well as he lowered the overall best time by seven tenths.
In the morning, he stole the lead from top rookie Jake Dennis at the two-hour mark before bringing out the safety car.
The field failed to match his effort afterwards with Dennis becoming the best of the rest, 0.482s behind.
Alexander Albon edged out sophomore driver Sandy Stuvik and ART teammate Nyck de Vries for third, while Renault juniors Jack Aitken and Kevin Jorg completed the top seven.
Although Trident's Artur Janosz led most of the afternoon running, it was Fuoco jumping into the lead in the dying minutes.
Janosz completed a dominant Trident 1-2 as Alex Palou and Oscar Tunjo were more than six tenths adrift in third and fourth respectively.
Koiranen's Matt Parry took fifth with Jenzer's sole confirmed driver Akash Nandy becoming the top rookie in sixth.
Alongside Nandy and Tunjo, the Swiss team added Formula Renault 2.0 Alps graduate Hongli Ye to its testing lineup, the Chinese driver taking 10th in the second practice.
Day 3 results
|2.||Jake Dennis||Arden International||1:27.775||1:29.826|
|3.||Alexander Albon||ART Grand Prix||1:28.051||1:32.502|
|5.||Nyck de Vries||ART Grand Prix||1:28.173||1:32.103|
|7.||Jack Aitken||Arden International||1:28.247||1:31.079|
|8.||Tatiana Calderon||Arden International||1:28.323||No Time|
|9.||Matevos Isaakyan||Koiranen GP||1:28.366||1:31.717|
|11.||Ralph Boschung||Koiranen GP||1:28.408||1:32.123|
|12.||Charles Leclerc||ART Grand Prix||1:28.428||1:32.206|
|14.||Nirei Fukuzumi||ART Grand Prix||1:28.599||1:32.007|
|16.||Alex Palou||Campos Racing||1:28.663||1:28.906|
|17.||Matt Parry||Koiranen GP||1:28.765||1:29.203|
|18.||Konstantin Tereshchenko||Campos Racing||1:28.947||1:31.424|
|19.||Steijn Schothorst||Campos Racing||1:28.992||1:30.603|
|20.||Akash Nandy||Jenzer Motorsport||1:29.052||1:29.323|
|21.||Oscar Tunjo||Jenzer Motorsport||1:29.129||1:28.975|
|23.||Mahaveer Raghunathan||Koiranen GP||1:30.183||1:31.807|
|24.||Hongli Ye||Jenzer Motorsport||1:30.785||1:30.105|