 The tone of baseball rivalries changed in the early 1990s ; fraternization between players who had moved to different teams or knew each other from various ventures kept baseball rivalries to a " friendly " level . Major League Baseball 's 1994 divisional re @-@ alignment solidified the rivalry between the Yankees and Red Sox . Prior to the realignment , the American League East Division contained seven teams , spread out over a wider geographical area , including the Cleveland Indians and the Milwaukee Brewers . 
