SANTA CLARA – Fourth-quarter heroics kept the 49ers undefeated through three games. Not four games.

The 49ers’ first loss of the season came Sunday when they failed to completely erase a 26-14 fourth-quarter deficit and fell 26-21 to the Jacksonville Jaguars.

Four turnovers, a critical special-teams gaffe, and a nonexistent pass rush doomed the 49ers, who saw Brock Purdy charged with three of those turnovers in his return from a two-game hiatus.

The 49ers (3-1) did attempt a fourth-quarter comeback. The Jaguars (3-1) spoiled it for their first win in three Bay Area visits.

Purdy, intercepted twice earlier in the game, got stripped of the ball near midfield by former 49ers defensive lineman Arik Armstead with 2:47 remaining. The Jaguars’ Foyesade Oluokun recovered that football, and the

See Full Page