The 49ers just lost their preseason opener to the Denver Broncos by a score of 30-9. Here are the 49ers' grades for this performance.

Defensively, the Broncos poured it on, taking the ball away four times, and sacking the quarterbacks twice. Depth standouts ...

The 49ers scored a touchdown on their opening series of the preseason, then their defense crumbled by halftime against the ...