Drafted: 1st round, No. 13 overall

In case you don't remember Trea Turner's brief stint with the San Diego Padres, it was enough to spark a rule change across Major League Baseball.

The Padres, Nationals and Rays agreed to a three-team, 11-player deal on Dec. 19, 2014, with Turner unofficially the "player to be named" heading from San Diego to Washington in that transaction. Rules at the time stated that a player could not be traded until one calendar year after he was drafted, so Turner spent the first half of the 2015 season playing in the San Diego system, even though it was universally known he would be sent to the Nationals on June 14, 2015 which was one year after the date he signed. If he had gotten injured in the interim, it would have thrown the entire trade into flux.