I always follow the NBA, especially all Los Angeles Lakers games. It's been my favorite club since Kobe Bryant started his career. I also really like watching cyber sports and baseball. In baseball and cybersports, there are no specific teams that I root for. I just like the process of the game itself.
I follow boxing fights tennis and Dota 2 I follow these sports and of course I follow poker that I can't miss because I'm a poker player and sometimes I spy on high-stakes players why they play this way and draw conclusions and try to repeat and see if I'm successful or not so sometimes it's very useful
Football, and i tend to only watch my club or country, and probably the major tourneys. Other than that, i find watching other sports quite mundane, unless it involves my nation or someone from my nation.