49ers' Week 4 PFF grades display determination they needed to defeat Broncos

NBCS Bay Area - SANTA CLARA — In the 49ers’ 24-14 win over the Denver Broncos on Sunday at Levi’s Stadium, San Francisco’s PFF grades show the toughness it needed to have on the field to get the victory. Purdy received the third-highest grade (73.1) on the offense, behind only...