In Mexico, the popularity of lucha libre, literally “free struggle” or “free fight,” is rivaled only by soccer. Wrestlers star not only in the ring, but in movies, comic books, commercials and magazines. Now the sport’s following in this country is beginning to swell, driven by the desire of many assimilated Mexicans to reacquaint themselves with a part of their heritage and by the nostalgia more-recent arrivals have for their homeland.