No problem for the San Francisco 49ers. Behind a valiant effort from Brock Purdy, Christian McCaffrey and an undermanned defense alike, the 49ers upset the Philadelphia Eagles, 23–19.

The Seattle Seahawks and San Francisco 49ers will square off for the second time in a three-week span on Saturday night, though this battle between the two NFC West foes feels different.

For the second time in three weeks, the San Francisco 49ers and the Seattle Seahawks face off. While the division title and top seed in the NFC were on the line three weeks ago, the stakes are even higher this weekend. The winner advances to the NFC Championship. The loser goes fishing.

The NFL has plenty of rivalries with a rich, extensive history dating back to the start of the Super Bowl era. Bears - Packers, Steelers - Ravens and Jets - Patriots are some of the matchups that have thrilled fans for decades upon decades. In the 21st century alone, however, some new rivalries have come to the forefront.