Williams have announced that Alex Lynn will be behind the wheel of the FW38 on the opening day of the post-Spanish GP test.
Following the Spanish Grand Prix, the Formula 1 teams will remain at the Barcelona circuit for a two-day test on 17-18 May.
Williams have revealed that test driver Lynn, who joined the Grove outfit in 2015, will be in action on Day One.
He will then hand the FW38 over to Felipe Massa for Wednesday running.
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