Los Angeles Dodgers manager Dave Roberts and his Boston Red Sox counterpart, Alex Cora, hope their historic World Series breakthrough will bring more opportunities for minorities in Major League Baseball. Cora, the first Puerto Rican manager in World Series history, and Roberts, the son of a Japanese mother and African-American father, will be the first minority managers to guide opposing teams in a World Series when the best-of-seven final opens Tuesday at Fenway Park.