10. Miguel Castro
The Blue Jays signed Miguel Castro just two weeks after his 17th birthday back in 2012 for just $43,000. Three years after his signing and at just 20-years of age, Castro was closing out games to start the 2015 season for the Blue Jays. After just 18 appearances and four saves, Castro was showing signs of struggling with control and was sent back down to the minors to develop a little more. Toronto would be in a playoff hunt by mid season and used Castro as part of the package to acquire Troy Tulowitzki and LaTroy Hawkins.
Blue Jays: Top 10 International Free Agents
