Williams finished Season 6 first in the D3 constructors' standings on 347 points, 24 ahead of Haas on 323.
Atmjosh15 won the Brazil D3 race from P3 for Haas, with SixPath HamM climbing from P12 to second in the other Haas. OnlineGuy99 finished third for Williams.
A Haas one-two falls 24 points short
Haas maximised the first two finishing positions, but Williams answered with OnlineGuy99's podium. The cumulative advantage absorbed the finale swing.
The final gap is smaller than a standard 30-point victory and far smaller than Ferrari's D2 margin. It is the closest of the three direct-division constructors' finishes.
The drivers' leader stays with Williams too
Jak75421 finishes first in the D3 drivers' standings on 234 points, 32 ahead of ContexRL. Williams therefore retains both leading D3 totals despite Haas controlling the final race.
Brazil is the constructors' stress test Williams survives rather than a victory lap: Haas wins, locks out the first two and still finishes 24 behind.
