In a tightly contested matchup, the San Francisco 49ers narrowly defeated the Detroit Lions 20-18 in Week 4 of the 2027 season. Both teams fought hard, but the 49ers managed to hold off the Lions for a crucial victory that keeps them competitive in the playoff race. Brock Purdy led the 49ers with an impressive 255 passing yards, connecting effectively with his receivers, including Ricky Pearsall, who racked up 101 receiving yards. Christian McCaffrey also made a significant impact on the ground, rushing for 85 yards and helping to maintain the offensive momentum throughout the game. Meanwhile, Jalen Milroe found the end zone once through the air for the Lions, but it wasn't enough to clinch the win. Defensively, Renardo Green was a standout for the 49ers, recording 10 tackles and anchoring a unit that stifled the Lions' late-game efforts. The turning point came in the final minutes when Aidan Hutchinson of the Lions recorded his 2.5 sacks, putting pressure on Purdy but ultimately failing to secure the ball back for his team. Kerby Joseph's interception provided a glimmer of hope for Detroit, but the 49ers' defense held strong when it mattered most, sealing their victory.