When you're whole post is in caps, you have to throw in a lower case letter in there somewhere, or else the whole post will be converted to lower case.
cf is just commonly used to stand for "cap filler".
When you're up 2-0 and you're down by two runs, you have to keyhole a fastball. If it's not in that tight window you create, then just take it. Worst case you're still up 2-1. Lot of dumbness in baseball these days.