August 27, 2012
"The analysis reveals that foreign-born players—the vast majority of whom are Latino—are at a distinct disadvantage when it comes to receiving praise for intangibles. Latino players are almost 13 percent less likely to be praised for intangibles than their white counterparts. Announcers are nearly 14 percent more likely to praise a US/Canadian-born player for intangibles than they are their international counterparts. Unfortunately, data is inconclusive as to whether or not American-born Latino players such as the Dodgers’ Adrian Gonzalez are also at a disadvantage, or whether the bias only applies to foreign-born Latinos. Black players—a population in decline in MLB—are not at any particular disadvantage. There are not enough Asian players in MLB to draw any meaningful conclusions."

How MLB Announcers Favor American Players Over Foreign Ones - Adam Felder & Seth Amitin - The Atlantic