After the Baltimore Ravens conquered the number one defense in the NFL four weeks ago, they meet with the number one defense once again. This time, the San Francisco 49ers hold the title, dethroning the New England Patriots. Right now, their opponents are averaging only 248 yards per game (1st in the NFL) and only allowing 136.9 yards passing (1st in the NFL). The problem, though, is their run defense, which is ranked 19th in the league, allowing an average of 111.1 yards per game. Meanwhile, the Ravens are averaging 210 yards on the ground alone.