Super Bowl champion Seahawks defense vs. Brock Purdy's 49ers will be one of Week 5's top battles. Here's why

Purdy is playing the best of any QB in the league this season, but now he How well is San Francisco 49ers quarterback Brock Purdy playing right now in his team's 4-0 start to the 2026 season? He's on such a tear that he created his own statistical club. Purdy is the only quarterback in NFL history to start 4-0 with one or fewer sacks, fumbles or interceptions combined, according to CBS Sports Research. Purdy leads the NFL in passer rating (126.2), passing success rate (61.9%) and expected points added (EPA) per dropback (0.53) while co-leading the league in passing touchdowns (11). Purdy's EPA per dropback of 0.53 is the second-highest through four games in the 21st century, behind only Tom Brady's 0.59 EPA per dropback in New England's 16-0 2007 regular season.

He's also been accurate, ranking fifth in the NFL in completion percentage (69.9%). However, he'll now be tested by the best of the best in Week 5 when playing at Lumen Field against the defending Super Bowl champion Seattle Seahawks. San Francisco leads the NFL in yards per play this season (6.8), but Seattle leads the NFL in yards per play allowed (4.0). In each of the last two showdowns, the Seahawks' defense had the edge over the 49ers' offense. In Week 18 of the 2025 season,