The Answer to sport worldwide is Soccer, but the biggest fan based team in America is The Dallas Cowboys
Unfortunately Manchester United as they have a fan base of over 330 million idiots.
Volleyball is the sport with the highest net.
The #1 Fan followed sport in the U.S is Nascar
Futbol or as known in America soccer is the sport with the highest participation.
rugby is a way better sport if you think football is better you are a gay homosexual :-)It is really a personal preference as to which is better. Each sport has their own fan base.
The highest paid major league sport is the NBA. After that would be the IPL.