Boo! Different Shirt!

A lot of factors can go into shaping a sports rivalry. There's shared history, geographical proximity, recent playoff match-ups, and so on. I suspect, though, that the biggest factor determining the strength of a rivalry is, quite simply, volume. Your biggest rivals will tend to be the teams you play most often.It happens that some cities have "natural" rivalries with other cities, across all (or multiple) sports. Cleveland is not one of those. The Browns' biggest rivals, for example, are clearly Pittsburgh, Baltimore, and Cincinnati, in that order. But neither the Pirates, Orioles, or Reds registers as much of a blip on the Indians' radar, nor does any of those cities have an NBA team.Meanwhile, an Indians fan might tell you that their closest rival is the Yankees, but would any Yankees fan say the same? I spoke to an anonymous source in the Yankees front office, who told me, "In... di-ans? Oh, right. The Indians are far, far down on [the Yankees'] li...