**Edit** I see the day coming (if it's not already here) when a coach or coaches will seek out an opposing player after the game, during the handshakes where they tell the kid, "you really played a great game today, if you ever get tired of playing for a team that's not winning, we'd love to have you at the U of >>>" They would have then had a chance to see the kid on film, and in person as well as size up the kid to see how big he actually is.
I guarantee it happens in baseball at every level prior to the signing of actual contracts.