Three things that could go wrong for Ravens vs. Texans

1. Arian Foster breaks out for big game. The Texans running back has been one of the biggest surprises in the NFL, leading the league in rushing, yards from scrimmage, touchdowns, touchdowns rushing and first downs. The Ravens can't afford to miss tackles against him.

2. Michael Oher struggles. The Ravens left tackle has to shake off a poor effort from last Sunday when he got called for false starts and allowed too much pressure from Joe Flacco's blind side. Oher's assignment this week is Mario Williams, who tops Houston with 8.5 sacks, 19 hits on the quarterback and 10 tackles for loss despite battling a sports hernia.

3. Fail to finish off another game. In each of their four losses, the Ravens have lost a fourth-quarter lead with less than five minutes left in regulation. They've given up 90 points in the fourth quarter, their most in any quarter this season.

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