Touching moment on the baseball field Tuesday ... Aaron Judge took time out of his pregame warmup to surprise a little kid who's dad just recently died -- and their meeting was awesome.
Kellen Wilson's father, Kyle -- who attended Judge's alma mater, Fresno State -- tragically passed away last October at the age of the 36 ... and Judge was so moved by the story, he sent the kid a jersey a few weeks later.
But when Aaron's Yankees made the trip to Wilson's hometown to play the A's on Tuesday .