Before I get into the list of the fastest-growing teams in all of sports, let me elaborate on my rationale. I'm picking major sports teams that might considerably rank in the top 100 in the world; this isn't to discount rapidly growing leagues like the IPL, whose viewership numbers are huge, or new leagues like Premier Lacrosse League (whose year-over-year growth will be massive, considering it did not exist last year). I'm hoping to capture growth that involves tens if not hundreds of millions, so I'd consider this list a pretty "macro" look at things.
Also, I'm using team valuations from Forbes' popular team valuations resource. While Forbes has its own methodology, its assessments (which takes into account direct team revenues and debts) are pretty accurate—the Kansas City Royals recently sold for around $1 billion, and Forbes had them worth $1.025 billion.
Alright, let's do this.