In a decisive display, the San Francisco 49ers topped the Detroit Lions 21-7 in Week 4 of the 2027 season, solidifying their position as a contender. With playoff aspirations on the line, the 49ers delivered a strong performance to secure their victory on the road. Brock Purdy led the charge for San Francisco, throwing for 269 yards and three touchdowns, showcasing his ability to command the offense effectively. Tight end George Kittle was his top target, racking up 86 receiving yards, while the Lions struggled to contain the 49ers' passing attack. Jahmyr Gibbs was a bright spot for Detroit, rushing for 100 yards, but it wasn't enough to keep pace with San Francisco's offensive firepower. Defensively, the 49ers made critical plays to turn the tide in their favor. Fred Warner's two interceptions were pivotal, stifling any momentum the Lions tried to build. The 49ers' defense also featured Malik Mustapha, who led the team with six tackles, contributing to a solid overall performance that kept Detroit out of the end zone until late in the game.