49ers game grades: Potent game plan, Brock Purdy overcome new injuries, tiring defense

The San Francisco 49ers secured a 36-30 victory over the Arizona Cardinals, improving their record to 3-0. Head coach Kyle Shanahan's game plan proved effective in overcoming injuries to key players and a sagging defense. Wide receiver Mike Evans, Trent Williams, the left tackle, and the defensive line all suffered injuries throughout the game, creating concerns for the team's future performance.

Offensively, Brock Purdy threw for four touchdowns, while Christian McCaffrey rushed for a season-high 19 total touches and a touchdown. The defense struggled to stop the Cardinals' offense, allowing 365 total yards and failing to generate any sacks or significant QB hits. Special teams suffered from some sloppiness, including a punt that was recovered at the 49ers' 28-yard line, setting up an Arizona touchdown.

Despite these issues, Shanahan's strategic approach and Purdy's performance were praised, as the team maintained their winning start to the season. However, the mounting injuries and defensive struggles suggest that the 49ers will face significant challenges ahead.