College football preview 2013: Four teams that can beat Alabama

Given Alabama's dominance the past four years, taking the Crimson Tide against the field to win the national title seems like a safe bet. But that doesn't mean Alabama is invincible. SI.com's Stewart Mandel and Andy Staples envisioned four scenarios in which the Crimson Tide might get derailed on their quest for a third consecutive national title. Click the corresponding image below to read about each matchup. For more college football preview content, check out SI's 2013 schedule guide, preseason All-America Team, media roundtable, lists of impact freshmen, potential BCS sleepers, teams with holes to fill and much more.

A hypothetical outcome of an Alabama-Stanford matchup in the national title game on Jan. 6.
A hypothetical outcome of Alabama's matchup with Texas A&M on Sept. 14 in College Station.
A hypothetical outcome of an Alabama-Ohio State matchup in the national title game on Jan. 6.
A hypothetical outcome of an Alabama-South Carolina matchup in the SEC title game on Dec. 7.
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