Niners yank Shaun Hill

Facing a 21-0 deficit at halftime in Houston, the San Francisco 49ers sent starting quarterback Shaun Hill to the bench, opting instead for backup Alex Smith.

And so Smith, the first overall pick in 2005, led the Niners to a touchdown on his first drive of the game.

The score came via a 29-yard catch and run to tight end Vernon Davis.

In his NFL debut, receiver Michael Crabtree has caught three passes for 39 yards.