My P/OF 16yo is starting to develop the yips. He is fine on the mound, and throwing from distance. It is only when warming up, from distances between 40-70'. Once he gets to around 90' he's fine, and is very accurate to distances as long as 280'. His accuracy is fine doing tempo catch.
He has a strong arm, and is healthy. Up till this winter he had nerve pain in his elbow when pitching, but totally revamped his motion, giving him 8-10MPH more on his fastball, and allowing him to throw a ball 70' longer in long toss, all with no pain.
I try to tell him it could be worse, as OF'ers don't really have to worry about 50' throws, but he gets embarrassed warming up before games. His throw can be 10' over his partners head, or he can spike it 10' in front of him.