The San Francisco 49ers put on a commanding performance, defeating the Arizona Cardinals 34-6 in Week 18 of the 2026 season. With playoff positioning on the line, the 49ers showcased their dominance, securing a vital victory as they head into the postseason. Brock Purdy was exceptional under center, throwing for 320 yards and guiding the offense with precision. Christian McCaffrey contributed significantly on the ground, racking up 75 rushing yards, while Ricky Pearsall stood out in the receiving corps with 103 yards, consistently moving the chains and finding space against the Cardinals' defense. Defensively, the 49ers made their mark with a relentless pass rush, highlighted by Nick Bosa's two sacks that disrupted Arizona's rhythm. The turning point came in the second quarter when Bosa's pressure led to a turnover, allowing the 49ers to extend their lead and seize control of the game. Meanwhile, the Cardinals struggled to keep pace, with Sean Murphy-Bunting leading his team in tackles but unable to contain San Francisco's offensive onslaught.