Despite advancements in scouting and player development, there are still athletes who fall through the cracks.
We pulled out 16 of the most famous examples of this phenomenon.
They were all either undrafted or went to tiny colleges that pro scouts have never heard of.
After some luck and hard work, they rose up from the bottom and are now big names.
Houston Rockets player Jeremy Lin went to Harvard and played in the D-League
Cowboys QB Tony Romo wasn't even drafted out of Eastern Illinois
Colts kicker Adam Vinatieri once played for the Amsterdam Admirals in the Netherlands
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