Which real-life sport is the best choice for scifi/fantasy fans?

Quiddich is great, but I've always wanted to follow at least one sport that exists in real life. I'm sure I'm not the only one. Which sports are most likely to work for a person who loves science fiction and fantasy? Where is a nice geek supposed to start?

Please tell us which sport you'd recommend and why — as well as which games to start with. Should I be watching college games or national leagues or some other set of games I don't know about because I've been too busy reading Guardians of the Galaxy comics?