49ers vs. Seahawks: 3 biggest difference-makers for 49ers defense

The 49ers’ defense has struggled to get stops the last three weeks. They’re allowing 35.3 points per game over their last three. That’s not going to earn a victory over the Seahawks with the NFC West on the line. San Francisco’s defense has likely …

SS Marcell Harris

(Photo by Lachlan Cunningham/Getty Images)

It looks like Harris will start again with Jaquiski Tartt officially ‘doubtful’ with a rib injury. Teams have gone right at Harris since he stepped into the starting strong safety role for Tartt. The results with Harris have been mixed, but Seattle has the personal to go right at the second-year sixth-round pick. They’ll use plenty of play action and look for tight end Jacob Hollister in the passing game to attack Harris. He has to stay disciplined on play action and ensure he’s communicating well in the secondary to limit big plays and blown coverages. He also has to have a strong game tackling against a run-heavy offense like Seattle. If Harris puts it all together, he could make a significant difference in a struggling 49ers secondary.