Red Bull's Daniel Ricciardo topped the timesheet at Sakhir this morning on day 1 of this week's in-season test at Bahrain.
The Aussie was fastest on the back of a series of short runs, achieving a 1:32.349 with supersoft tyres, just edging out Lewis Hamilton.
The Mercedes fell victim to an electrical problem early on which brought out the red flag but, disrupting the team's programme which is centered around getting a better understanding of tyre wear and temperatures, a major weakness in last Sunday's Bahrain GP.
Hamilton was able to resume his running although it took close to 30 minutes to get his W08 back to the pits.
A second red flag came out rookie Sean Gelael parked his Toro Rosso after a suspected engine failure. The Indonesian is set to return to action when the team completes replaces his Renault power unit.
McLaren-Honda's prospects for the day were hit when a water leak was discovered in the ERS, keeping Oliver Turvey out of the action
GALLERY: All the action from the Day 1 in-season testing at Bahrain
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