He has an insurmountable 68-point lead over British rival Oliver Rowland.
Leclerc had started from pole position for the eighth time this season, a record for the Formula One support series that was previously known as GP2.
The Monegasque is due to drive for Sauber in Friday practice at three of the last four grands prix this season.
(Reporting by Alan Baldwin, editing by Ed Osmond)
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