There's an article on the San Francisco Chronicle website about Mexican baseball in which the author mentions every one of the 16 teams in the majors, with the exception of the Vaqueros Laguna. The oversight is much appreciated.
He also says that in terms of popularity, baseball is a "strong second" to soccer. I think it depends where you are in the country, but I was surprised when I got here about how unpopular baseball is, both at the youth and professional level. Forget about soccer; American football and boxing both have either weekly or near-weekly television deals on network TV, where MLB baseball doesn't appear until the World Series. (Mexican league games in baseball and football remain on cable throughout the year.) The number of kids I know who play football outnumbers those who play baseball by around 20 to one. For boxing, it's probably closer to five to one. From my vantage point, I'd put baseball either fourth or fifth on the list of popular Mexican sports, either just ahead of or right behind basketball.