The San Francisco 49ers preseason slate opens Saturday evening against the Denver Broncos at Levi's Stadium.

San Francisco 49ers backup QB Mac Jones speaks to reporters after his team's 30-9 preseason loss to the Denver Broncos on ...

San Francisco 49ers coach Kyle Shanahan speaks to reporters after his team's preseason loss to the Denver Broncos on Saturday ...

San Francisco 49ers quarterback Mac Jones began his new chapter in red and gold by leading a touchdown drive to open the game ...

Mac Jones is excited for the challenge to grow with San Francisco's offense after making his debut with the team Saturday.

Quarterback Mac Jones made his San Francisco 49ers debut on Saturday night, playing three drives to open the preseason ...

Outside linebacker Nik Bonitto and defensive lineman John Franklin-Myers team up for back-to-back sacks. The Denver Broncos ...

Kalia Davis appeared to take a big step toward a Week 1 starting spot, while Chase Lucas thrust himself into the cornerback ...

The San Francisco 49ers absorbed a 30-9 preseason loss to the Denver Broncos as No. 2 QB Mac Jones provided flashes of the frustration that has characterized his career.

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.

Jarrett Stidham threw two touchdown passes, leading the Denver Broncos to a 30-9 victory over the San Francisco 49ers.

The San Francisco 49ers opened the preseason with the newly acquired Mac Jones under center. Jones made a good first ...