San Antonio, TX
2014 Population: 1,436,697
Growth Rate: +8.23%
San Antonio is the only top-10 city in the US without a baseball team. That should probably change sometime in the not-so-distant future. San Antonio has the million-plus population of a big-market team and is also not that far from Austin, a city that could crack 1,000,000 people very soon (15.49% growth rate). People are flocking to Texas, and two baseball teams are not enough. San Antonio has only one professional sports team, but the Spurs are a model franchise. They have proven that a professional team can live in Southcentral Texas.
Of all the cities on this list, San Antonio makes the most sense for Major League Baseball. Population growth in Texas shows no signs of slowing. California can support three teams, and so can Texas.