I also have the yips, or some variant of it, but not for baseball.
I actually play the piano and I used to play it seriously. Although I always had trouble with certain fingering/wrist movements. It was very hard to explain to other people, but basically my hands refused to play certain passages.
If you asked me to play that passage individually right from the start of the passage, I could do it. But if you asked me to start, say, a few bars before the passage, I would not be able to do it. My wrist locked up.
Also when I was younger in elementary school I had a lot of trouble pronouncing words if they stared with certain letters. So if you asked me to start a sentence with the word "For" or "How", I'd have a bit of trouble getting the words come out of my mouth. Nowadays I don't have a problem!