What sport brings in the most revenue worldwide?

Has to be football. Also know as soccer in the United States. No American sports are played all over the world. Baseball is played in US and Caribbean countries. American football (NFL) is only played in US and some European countries. Soccer in England, for examples has four professional divisions supporting twenty teams each. This does NOT count Ireland Scotland and Wales. Soccer is king of the world. Tune in for the World Cup.

To clarify, this is true for a sport in general. However, the most revenue by individual leagues by far are the NFL closely followed by the MLB in the U.S.