49ers’ 5 keys to a wild-card upset over the Philadelphia Eagles

PHILADELPHIA – Only one team gets the first crack at dethroning last season’s Super Bowl champion, the Philadelphia Eagles.

The 49ers, for all their injuries and faults, can do the honors in Sunday’s wild-card visit to Lincoln Financial Field.

“The confidence level is sky high,” fullback Kyle Juszczyk said.

The 49ers (12-5) crashed back to earth last Saturday night, however. With the NFC playoffs’ No. 1 seed at stake and a six-game win streak in tow, they bowed 13-3 to the...