The 49ers defeated the Miami Dolphins, 33-17, and Purdy did his part after taking over for starting quarterback Jimmy Garoppolo, who sustained a season-ending foot fracture.
Backup running back Jordan Mason, a rookie, contributed 51 yards on eight carries and showed why he has earned playing time over third-round draft pick Ty Davis-Price.
The 49ers’ top-ranked run defense made the Dolphins become one-dimensional.
And the Dolphins did not even try to stick with their running game.
Mostert had 30 yards on seven carries, and Wilson had just one carry for 3 yards.
The game could not have started any worse for the 49ers, who experienced confusion in the defensive backfield on the first snap of the game.
After that, the 49ers’ defense settled down, and defensive end Nick Bosa turned up the heat on Tagovailoa with three sacks, including a sack-strip that resulted in Dre Greenlaw’s game-clinching fumble return for a touchdown.
Ray-Ray McCloud had a 20-yard punt return that helped set up the 49ers’ first touchdown of the game.
Coach Kyle Shanahan had two important challenges to overturn Dolphins pass completions, including on a fourth-down play with six minutes left in the game
The 49ers dominated this game on third downs and in the turnover category