Interesting stats:
High school: Around 0.0277% of high school baseball players will make it to the majors.
College: Around 0.37% of college players make it to the majors.
Drafted players: Approximately 17.6% of drafted and signed players go on to play in the majors.
Minor leaguers: About 10% of minor leaguers make it to the major leagues, some for just one game.
First round: 66% make to the majors
Second round: The success rate drops to about 51%
Third round: The success rate drops to about 40%