Recent changes in U.S. immigration law and growing competition in baseball for raw talent have allowed the minor-league farm system to flourish with imported players. It has been a home run for globalization, but bad news for U.S.-born players, who suddenly have much more competition. Across the minor and major leagues, the total number of foreign-born players is growing fast, to almost 3,500 of the 8,532 players under contract this summer, from 2,964 three years ago.

The surge of young foreign players into the U.S. minor leagues began in 2007, a few months after then-president and former major-league team owner George W. Bush signed the Creating Opportunities for Minor League Professionals, Entertainers and Teams Act, known as the Compete Act. It freed the farm systems of major-league teams from having to compete with all U.S. employers seeking H2B work visas for foreign employees, the supply of which usually was exhausted each year by February. Now, teams can import as many prospects as they want.

"There is no longer a limit on work visas," explains Oneri Fleita, the Florida-born director of minor-league development for the Cubs. "So, yeah, you might see more foreign players getting an opportunity."