there are several teams I like in MLB.... and I can't call myself a 'real fan' because I don't now, nor have I ever, had one 'favorite' team... although I always DO have a favorite in any given year... it just changes yearly.
Over the years I have rooted for the Pirates, (still love the '60 WS), Angels, Dodgers AND Giants (yes, I know, that's sacrilege), Cubs, White Sox, Red Sox, Phillies, Cards, and several others.
I'm still very fond of the Orioles because of getting their ring in a box of "Cracker-Jacks" when I was like 7 years old.
I WISH, truly, I HAD a favorite baseball team but that's just not something you can pronounce without good reason... and I've never been able to find that 'one reason' to attach myself to one baseball team. Unlike most I don't have a 'geographical' reason to follow any certain team. Around me pro baseball teams are a dime a dozen.