It's hard to watch the college-baseball World Series, under way now in Omaha, Neb., without noticing how different the college game is from the major-league version. Not in the caliber of play or the funny ping of the aluminum bats, but in the way the players look.

College players in the three main divisions are 86% white, according to the most-recent NCAA figures. That's a big difference from Major League Baseball, where one study puts the number at less than 60%. The most striking difference is in the number of Latinos on...