Pro athletes like LeBron James, Sidney Crosby and Bryce Harper are rare phenomenons. Most athletes don't have the combination of raw physical talent and instincts to seamlessly make the transition into the pros and immediately contribute.
Aspiring pro athletes certainly have talent, but for most, the first half of their career is about development and proving their value to a team.
For those veteran stars who survived the process and went on to have a Hall of Fame career, or a career somewhere in between bust and glory, those rookie moments frozen in time can be quite revealing. Perhaps a glint of genuine fear in their eyes belie the swagger.
Or maybe the rookie photo of a man or woman whose path has taken them down darker roads than expected reminds us of the sense of hope and renewal their budding career presented.
These are 100 awesome pictures of sports stars as rookies.