San Francisco 49ers: 5 Starters Who Must Step Up in the 3rd Preseason Game

The San Francisco 49ers will play the Houston Texans this coming Friday night. It marks the third exhibition game for both squads and the time for players to grab hold of their starting positions.

Head coach Jim Harbaugh needs some players to step up and begin to show that they merit their starting jobs. The 49ers are not a deep team, so it will be critical for the players Harbaugh is counting on to deliver.

Let's take a closer look at some of the key players the 49ers need to play well in 2011. 

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