Six Degrees of MLB

Major League Baseball's pennant contests are on. The National League Championship Series started last night in Arizona, where the Diamondbacks faced the Colorado Rockies.

Tonight, weather permitting, the Boston Red Sox will host the Cleveland Indians in game one of the American League Championship Series.

WBUR'S sports commentator Bill Littlefield has been musing over connections among the four teams and he's now ready to predict the ultimate winner.