Manor F1 development driver Jordan King finished the opening day of the second GP2 Series pre-season test in Bahrain top of the timesheets for Racing Engineering.
Rookie King, who was 13th in the morning session but top for the majority of the afternoon, edged out morning session pace setter Mitch Evans.
Norman Nato and Marco Sorensen had briefly gone fastest before King cemented his place at the top with a 1m41.494s.
New Zealander Evans was only 0.114s off the pace when he brought the first day to a premature end when he stopped out on track at turn 3 in the closing moments.
It was also a good afternoon session for two Series’ newcomers in the shape of Sergey Sirotkin and Formula Renault 3.5 graduate Nato.
Sirotkin, who could only manage 16th in the morning session, came home third in the afternoon with Nato a fraction behind in fourth after a strong showing in the morning which put him second.
Mclaren protege Stoffel Vandoorne rounded out the top five for ART, ahead of Sorensen, Julian Leal and the Lazarus of Nathanael Berthon.
Pierre Gasly, who will be testing for Toro Rosso in Barcelona in May, finished the afternoon ninth ahead of Artem Markelov who completed the top ten.