I'm just going to assume your favorite sport is football. If it isn't, feel free to keep that to yourself. You can answer the question of "what is your favorite sport?" instead of "what is your second favorite sport?" Aren't you special?
Anyway, my second favorite sport has long been baseball, but after a couple years of following soccer (or association football if you prefer) I'm starting to lean toward that. But only at the highest levels. I can't bring myself to care about MLS yet, but I'm sure that's coming.
So, answer the question or talk about whatever you want. This is an open thread after all.