Think Mexico's under-20s are a sure bet to top Jamaica Wednesday night and earn their ticket to the 2013 U-20 World Cup in Turkey?

You're probably right. Sergio Almaguer's team has shown class in spades thus far in Puebla, rolling over inferior competition to the tune of a 6-0 aggregate from two group wins. Mexico has experience, talent, goal-scoring class and confidence coming into Wednesday night's home showdown against the Jamaicans.

So what could go wrong? Plenty. These one-off quarterfinals are perfectly designed to create chaos. And even mighty Mexico isn't immune to an off night.

Here are three things to keep in mind before writing El Tri into the World Cup spot they're likely -- but not guaranteed -- to claim in Puebla.

A one-off match is just that.