49ers' Offensive Line Aims for Historical Sack-Free Streak Against Cardinals

The San Francisco 49ers' offensive line is on the cusp of achieving a rare historical mark as they prepare to face the Arizona Cardinals. Through the first two weeks of the season, the unit has not surrendered a single sack, a feat that places them among the league's elite and sets them up to potentially join an exclusive club.

Quarterback Brock Purdy has remained largely untouched this season, a testament to the protection provided by his offensive line. In an NFL where sacks are common, averaging 4.7 per game across the league through the first two weeks, Purdy has been an anomaly. The 49ers' offensive line, anchored by veteran Trent Williams, is the only unit in the league yet to allow a sack this season. This accomplishment marks a franchise first, as no previous 49ers team had started a season without allowing a sack by Week 2.

Adding to the line's success is the emergence of left guard Connor Colby. Initially a question mark, Colby, who started six games as a rookie, has performed consistently, allowing only two pressures over the past two weeks. Coach Kyle Shanahan noted that these past two games have been among Colby's most consistent performances. The offensive line's pass-blocking efficiency ranks second in the NFL, according to Pro Football Focus.

The 49ers' success when not allowing sacks under Shanahan is notable, with a record of 17-4. Their upcoming opponent, the Arizona Cardinals, has struggled defensively, ranking fourth from the bottom in sacks last season and continuing to rank in the bottom third of the league this season. Arizona's defense has also dialed up blitzes at a low rate, fourth-lowest in the league.

If the 49ers' offensive line can maintain its perfect protection against the Cardinals, they will become only the eighth team since 1970 to start a season without allowing a sack for three consecutive weeks. Six of the seven previous teams to achieve this milestone went on to make the playoffs.

While several 49ers teams in the 1970s achieved three sack-free games, none extended the streak to four games. The NFL record for the longest sack-free streak belongs to the 1988 Miami Dolphins, who went 12 consecutive games without allowing a sack of Dan Marino. Purdy wears No. 13 in honor of Marino, a number choice that now shares a historical parallel.

Beyond the offensive line's performance, the 49ers' offense has been efficient, particularly in the red zone, where they have scored touchdowns on every trip. The team's defense has also been strong, limiting opponents to only one touchdown in five red-zone trips.

Key matchups to watch include tight end Trey McBride against the 49ers' linebackers, particularly Fred Warner and Dre Greenlaw. McBride, a Pro Bowler, had a significant performance against the 49ers last season, but he faces a tougher assignment this year. Running back Christian McCaffrey, whose usage has been limited through the first two games, is expected to be more involved. The status of receiver Mike Evans, who is dealing with a hip injury, will also be monitored, potentially requiring other receivers to step up against the Cardinals' secondary.