After 20 minutes, de Vries was fourth, just over a second behind Verstappen. At this point, the yellow flags were waved briefly as Perez spun into the run-off area at Turn 4.
Verstappen improved on his own lap time with a 1min 34.346sec lap midway through the session and at that point was over a second quicker than anybody.
The times soon started tumbling as Sainz went fastest by 0.078sec. The Spaniard is already resigned to starting in the midfield after Ferrari confirmed that new parts fitted to his power unit, following the fiery end to his Austrian Grand Prix, will result in a ten-place grid penalty.
More drivers were fitting the soft tyre and picking up the pace, but Verstappen was still at the sharp end, going fastest again with a 1min 34.021 sec lap with 20min remaining. He still had more to deliver too, after understeering off in sector three during the lap.
But as the session approached its end, Leclerc went one better setting a 1min 33.930sec lap on soft tyres.
No driver was able to beat that time in the following 10min, although Russell had the satisfaction of being the fastest on medium tyres, with a 1min 34.881sec effort. Albon was the fastest hard-tyred runner after setting a 1min 35.414sec lap.
🏁 CLASSIFICATION (END OF FP1) 🏁
Leclerc, Verstappen and Sainz lead the way#FrenchGP #F1 pic.twitter.com/HorDHBNZvD
— Formula 1 (@F1) July 22, 2022