Christian McCaffrey scores four times, 49ers get fourth win

The Cardinals had some success offensively against the 49ers on Sunday, but Christian McCaffrey and Brock Purdy proved to be too much for their defense. McCaffrey scored four touchdowns and Purdy capped a late 14-play drive with a one-yard scoring run that put things out of reach. The 35-16 win moves the 49ers to 4-0 on the season and 9-0 in games started by Purdy in the regular season. The Cardinals were down 21-3, but scored two straight touchdowns to get back into the game in the third quarter. The second one came at the end of a 99-yard drive that showed quarterback Joshua Dobbs' growing comfort running the offense in Arizona, but the 49ers answered with McCaffrey's fourth score early in the fourth quarter. The ensuing Cardinals drive stalled near midfield and Arizona punted the ball away with over nine minutes to play. The 49ers would run 14 plays and eat more than seven minutes of time off the clock before Purdy's plunge into the end zone. The touchdown was their fifth on six offensive possessions that included more than kneeldown plays. The inability of Arizona's defense to get off the field proved to be a big part of the difference on Sunday. McCaffrey ran 20 times for 106...