George Russell topped the times for Mercedes ahead of McLaren's Oscar Piastri in Friday's rain-hit opening practice for this weekend's Hungarian Grand Prix.
In a wet session punctuated by crashes - including one by Red Bull's under-pressure Sergio Perez -- and red flags, Australian rookie Piastri clocked a best lap in 1min 38.795 sec to outpace Briton Russell by three tenths of a second.
The Aston Martin of Lance Stroll was third quickest ahead of Lando Norris in the second McLaren, two-time world champion Fernando Alonso and Alfa Romeo's Valtteri Bottas.
Defending champion Max Verstappen of Red Bull and seven-time champion Lewis Hamilton of Mercedes both chose not to run in the risky conditions.
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