Bad: SS Marcell Harris
Harris was good filling in for Jaquiski Tartt against the Ravens. He did not pick up where he left off against the Saints. Harris looked lost at times, was a step late on multiple plays in coverage and missed a slew of tackles on a day where tackling was a significant issue for the vaunted 49ers defense. San Francisco needed a good day out of their strong safety, and they got a decidedly bad one.