10. Cricket World Cup
Location: Rotates (2015 Australia/New Zealand)
Countries participating: Approximately 14
TV audience: 2.2B viewers (only behind Olympics and Football/Soccer World Cup)
Summary: With baseball being the National Pastime of the United States, Cricket has never taken off states-side. However, worldwide, this is a huge deal. Mostly former colonies of the British Empire, the media rights sold for $1.1B for the 2015 event (to give some perspective).