In a decisive showdown, the San Francisco 49ers topped the Arizona Cardinals 34-17 in Week 18 of the 2026 season, solidifying their playoff position. With both teams vying for momentum heading into the postseason, the 49ers showcased their dominance on both sides of the ball. Carson Beck led the Cardinals with a strong performance, throwing for 301 yards and two touchdowns, but it was Christian McCaffrey who shone for San Francisco, rushing for 85 yards and making key plays to keep drives alive. Meanwhile, Trey McBride was a standout receiver for Arizona, racking up 113 receiving yards, but the 49ers' balanced offense ultimately proved too much to handle. Defensively, San Francisco made its presence felt, with Dre Greenlaw leading the charge with six tackles. Nick Bosa contributed significantly with two sacks, putting pressure on Beck and disrupting Arizona's rhythm. The turning point came late in the second quarter when Marques Sigle's interception shifted momentum, allowing the 49ers to extend their lead and control the game heading into the second half.