Soccer
running EDIT: There was no main sport thay just played all the sports that existed.
Soccer (football) is the most popular sport in Mexico. See related questions for further details.
The most common sport anywhere in Mexico is soccer
Cheerleading is NOT an amateur sport, but everyone thinks it is. People probably think this because only girls participate in this sport most of the time. But the truth is, cheerleading is much harder than most sports. Like I say, "athletes lift weights, cheerleaders lift athletes."
It is the most widely played sport in Mexico.
soccer
baseball
SOCCER!
cheerleading
The common sport in the world is Futbol (Soccer).
Wrestling
soccer