MIAMI GARDENS, Fla. -- Colin Kaepernick was hot to start the game, but San Francisco's defense has wilted on its last two drives and the 49ers trail 14-7.
The 49ers quarterback, who drew attention in South Florida with his midweek defense of Cuban revolutionary Fidel Castro, was met with a chorus of boos when he and the offense took the field for their first possession.
Kaepernick completed three of four passes on the drive, including a touchdown toss Carlos Hyde. His only incompletion was a drop in the end zone by tight end Vance McDonald. Kaepernick is 9-14 for 63 yards and a 98.2 passer rating. He also leads all rushers with 62 yards.
Following their next drive, the 49ers got a big boost from their special teams when, punting from his own 31-yard line, Bradley Pinion boomed a 59-yard kick and Aaron Burbridge flung the Dolphins returner down at the Miami 9-yard line.
But while the 49ers run defense has been sharp, the pass defense has been spotty. The big blow came on a 46-yard throw from Ryan Tannehill to Devanate Parker, who had beaten Tramaine Brock on the play. The Dolphins drive lasted 11 plays, culminating with a two-yard run by Jay Ajayi, who has 25 rushing yards at the half.
At the start of the second quarter, a 30-yard run by Kaepernick took the 49ers into Miami territory. That was followed by productive runs by Hyde and DuJuan Harris. Tight end Garrett Celek, however, fumbled at the end of a 15-yard reception and the Dolphins took over at their own 16.
They went on another 11-play drive, this one ending in a down-the-center pass from Tannehill to tight end Dion Sims, who was sandwiched by Jimmie Ward and safety Jaquiski Tartt on the play.
The 49ers have allowed 206 yards so far, 154 of them through the air. The temperature is roughly 80 degrees but the humidity seems to be taking its toll. Every 49ers defender who is dressed for the game has been on the field on defense.