I used to watch a lot of pro fighting game tournaments. Not so much recently, since I have also fallen a bit out of playing the games myself.
Of actual sports, I only watch the occasional bit of tennis, and that's it. Oh and when I watch tennis, it's always the ladies
Even though I'm from a huge football nation (European football, of course), I hate it and never watch it. I can't name one single player on our national team.