Well, I've alway been rooting for home-town teams. Living in Toronto for last 11 years I've managed to catch a hockey bug. I'm a really big Maple Leafs fan. They are capable of making me very happy or giving me a heart attack.
I also enjoy baseball, although, not as much as hockey. I like Blue Jays, especially if I can watch them live (not an option with the Leafs). I love watching every pitch.
I just wish either team won a bit more often.