You want to talk X-factors in the Sweet 16 of the NCAA tournament?
How about X-men, like Xavier Thames (pictured above) of San Diego State? He's the senior guard who lit up North Dakota State for 30 points in the round of 32—and he plays pretty good defense, too, averaging 1.7 steals per game.
But this is more about the X-factors within the team concept.
Each of the remaining 16 teams has something that could tip the tournament in its favor, whether it's stellar defense, an explosive offense, free-throw shooting in the clutch (or for that matter, making free throws at all) or a top-notch coach who knows how to design just the right play at precisely the right moment.
Take a closer look at which teams will rely on what when crunch time arrives.