SANTA CLARA – Here is how the 49ers (3-0) graded in Sunday’s 16-15 win over the Arizona Cardinals (2-1) in their home opener:

PASS OFFENSE: B+

Mac Jones aggravated a month-old knee sprain but engineered a two-minute drive that yielded the 49ers’ walk-off field goal. Jones also shook off two fourth-quarter gaffes he blamed on himself: an interception at Arizona’s 20-yard line, and then a safety on the ensuing possession in which Calais Campbell swam past Dominick Puni for a holding penalty in the end zone. Jones relied too heavily on two targets – Christian McCaffrey (10 catches, 15 targets, 88 yards) and Ricky Pearsall (eight catches, 11 targets, 117 yards – but the 49ers were down, let’s see, George Kittle, Brandon Aiyuk, Jauan Jennings, Demarcus Robinson, Jordan Watkins, etc. Pearsall’

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