Click here for full GP2 testing results from day three at Circuit de Catalunya
Red Bull-backed driver Pierre Gasly has completed the first GP2 pre-season test in dominant form after topping his second consecutive day by pulling out a third of a second on the cahasing pack during the morning session at Circuit de Catalunya.
The French driver, who ended day two on quickest, produced his best time just before the lunch interval and held on to P1 despite a late challenge from Norman Nato, while GP2 rookie and Gasly's new team-mate Antonio Giovinazzi also impressed by taking third overall.
On the third day of the first test the majority of the GP2 field were slow to find outright pace initially but as the track temperature rose the lap times duly tumbled. After a brief red flag stoppage due Sergey Sirtokin's spin into the gravel at turn one, Gasly made the most of the clear track as it turned green to clock a best time of 1m 27.386s of the soft Pirelli tyres.
Nato quickly responded but was unable to get within Gasly's time and was forced to settle for second having pushed Giovinazzi down to third.
Williams F1 development driver Alex Lynn completed a productive pre-season test with fourth on the timesheet on the final day, fractionally ahead of Luca Ghiotto and Daniel de Jong.
After a slow start Mitch Evans showed positive improvements in seventh to edge out Nicholas Latifi, while Manor development driver Jordan King ended the day narrowly in front of day one topper Sirotkin.
The GP2 challengers with now head to Jerez for the second pre-season test on the 29-31 March.