With all the injuries they've had to deal with, the San Francisco 49ers have plenty of excuses not to win games. The 49ers stayed undefeated on Sunday after beating the Arizona Cardinals on a walk-off field goal from Eddy Pineiro. The 49ers came into the season without wide receiver Brandon Aiyuk, who is recovering from a torn ACL, and the injuries have only piled on since then. Much of the credit should go to Mac Jones, who has done an outstanding job under center with Purdy out. The former New England Patriots starter threw for 284 yards and a touchdown on Sunday, leading San Francisco's game-winning drive.