I don't watch a whole lot of sports anymore. I used to follow college basketball religiously. But once I got rid of cable, I just couldn't really be bothered to find it online. I usually only watch big rival games now. The only other sport I really watch is horse racing, but usually only the Triple Crown races.
I love watching the local women's volleyball league. The teams are well-balanced with the good players so the games were always exciting. However, I couldn't watch the games when there is mixed martial arts bouts because my husband is an avid fan of MMA fighting. Especially now that the UFC - ultimate fighting championship - have bouts twice a month and sometimes 3 times a month, I could only watch volleyball games at night, the replays.
I love watching tennis, football (soccer), basketball, volleyball, and table tennis (in that order of preference), although I haven't played tennis. I just think it's the most entertaining for me to watch.
I prefer to watch sports I grew up with and these are Football, Tennis and Volleyball. I tend to watch every game until the end. Even if I don't do sports now at least I have updates on them from time to time.