Thanks, all - OP here.
I really like the idea of trying to connect DS with a high school ball player to hear how much he practices, etc. DS is more apt to listen to him than to his parents

. Thanks for all of the ideas and for those who shared their own experiences.
In case I wasn't clear, I don't want to figure out some magic solution as to how to help DS to make a travel sport team. I want to figure out how to get DS to connect the dots between hard work/practice and results. This will apply to many things in his life, certainly not just sports, but I thought that with a goal that he dearly seeks (making travel ball) and has not yet achieved, he would/should be able to make the connection. It frustrates me that he still doesn't.