In a decisive Week 18 matchup, the San Francisco 49ers topped the Arizona Cardinals 31-16, securing their playoff positioning as the regular season draws to a close. With both teams vying for momentum heading into the postseason, the 49ers showcased their offensive prowess and defensive resilience throughout the contest. Brock Purdy was instrumental for San Francisco, throwing for three touchdowns and effectively managing the game. Carson Beck of the Cardinals led all passers with 272 yards but struggled to find the end zone, while Christian McCaffrey added a solid ground game with 90 rushing yards. De'Zhaun Stribling led the receiving corps for the 49ers, racking up 113 yards and creating crucial separation from defenders. Defensively, Alfred Collins made his presence felt with 1.5 sacks, disrupting the Cardinals’ rhythm and forcing crucial mistakes. The turning point came in the third quarter when the 49ers' defense stifled a potential scoring drive, allowing their offense to extend the lead and ultimately control the game. Sean Murphy-Bunting's eight tackles for Arizona showcased his determination, but it wasn’t enough to counter the 49ers’ balanced attack.