Jacob Cowing returned a punt for an 83-yard touchdown as the San Francisco 49ers beat the Los Angeles Chargers 41-17 in preseason action. 49ers quarterback Brock Purdy completed 4 of 6 passes for 29 yards after sitting out the team's first preseason game. Chargers quarterback Justin Herbert played the opening series, completing 1 of 2 passes. Eddy Pineiro kicked two field goals for the 49ers, who led 20-3 at halftime. The Chargers struggled with their run game and tackling.