Honda's reigning world champion Marc Marquez finished fourth on an eventful evening that saw 22-year-old compatriot Vinales drop from pole to fifth on the opening lap before making a stirring comeback for his second career victory.
The season's only night race started 45 minutes late after earlier rain, with plenty of discussion among the riders who did two warm-up laps before Vinales took his position at the front of the grid.
The race distance was shortened to 20 laps.
(Reporting by Alan Baldwin; Editing by Clare Fallon)
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