Tennis?
never really followed it, but I know a reasonable bit about the sport. Not how to play it, obviously, because I suck, but I know a few of the rules and most of the more high-profile players, both now and down the years.
I watch all the Slam finals if I can, though I missed the French women's final this year, and the Aussie ones I can only catch on replay... -_-
Favourite players? lessee... Female: Steffi Graf or Martina Hingis (and now LLA and LadyCs

)... Male: Pete Sampras or Goran Ivanisevic
Though I can't see anyone knocking Federer off his perch for some time ><