Qualifications : Mainstream

A sport should be mainstream.

This is a rather subjective criteria, basically the argument is if it doesn't draw an audience , it shouldn't be considered a sport. The big sports draw huge crowds in stadiums and in TV viewers. (Football, Baseball, Basketball, etc.. ) The problem with this criteria, is that if a new thing WAS a sport then it would not be considered a sport until it gained enough popularity to pass this imagery line of popularity. But within this point is the internal suggestion that the reason this or that doesn't pull an audience is that it's not really a sport. Soccer from an American perspective fails this test.