SANTA CLARA, Nov. 9 -- Brock Purdy gave the 49ers control early. When the Raiders threatened to take some of it back, San Francisco's defense repeatedly took the ball away, turning scoring opportunities for Las Vegas into another afternoon of separation on the scoreboard.

Purdy threw two touchdown passes and ran for another in Sunday's 38-17 victory at Levi's Stadium. The 49ers scored on their first three possessions, then forced five second-half turnovers to improve to 7-1. Las Vegas dropped to 4-5.

The most revealing swing came late in the third quarter. Michael Mayer lost the ball just short of the goal line, denying the Raiders a chance to cut into a 28-17 deficit. San Francisco recovered in the end zone, and Purdy answered with a 3...