NFL

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

October 9, 2026

The matchup between the San Francisco 49ers and the Seattle Seahawks presents a premier statistical battleground. San Francisco currently leads the NFL by averaging 6.8 yards per play on offense, while the Seattle defense leads the league by holding opponents to just 4.0 yards per play.

San Francisco 49ers quarterback Brock Purdy enters the game having established unprecedented efficiency marks. According to CBS Sports Research, Purdy is the only quarterback in NFL history to start 4-0 while recording one or fewer combined sacks, fumbles, or interceptions.

He currently leads the NFL in passer rating at 126.2, passing success rate at 61.9 percent, and expected points added per dropback at 0.53. Additionally, Purdy is tied for the league lead with 11 passing touchdowns and ranks fifth in completion percentage at 69.9 percent.

Purdy's current production places him in elite historical company. His 0.53 expected points added per dropback represents the second-highest mark recorded through four games in the 21st century.

The only quarterback to exceed this mark in the same timeframe is Tom Brady, who registered 0.59 expected points added per dropback during the New England Patriots' 16-0 regular season in 2007.

Despite these historic offensive numbers, the 49ers face a formidable challenge against a Seattle defense that has recently dominated their head-to-head matchups. In Week 18 of the 2025 season, the Seahawks limited San Francisco to a single field goal in a 13-3 victory.

The two teams met again in January for the NFC divisional round at Lumen Field, where Seattle secured a decisive 41-6 victory over San Francisco.

This report also draws on coverage from Awful Announcing, Yahoo Sports, sports.betmgm.com.