Drafted No. 8 overall in 2012 by the Pittsburgh Pirates, Mark Appel didn’t sign and went to pitch at Stanford University instead. In 2013, he landed a $6.35 million signing bonus with the Houston Astros.
Houston management was determined to push him through the minor leagues despite his struggles (and injuries), but they decided to cut bait and trade him to the Phillies in 2015. Appel never played above Triple-A and retired in February 2018. Asked in an ESPN.com article if he was the biggest draft bust of all time, Appel replied, “I probably am.”
Appel’s story wasn’t quite over yet, however. He returned to the Phillies organization in 2021 after three seasons away from the game and made his MLB debut on June 29, 2022, pitching a scoreless ninth inning for the Phillies just a few days shy of his 31st birthday.
It made Appel the oldest former No. 1 overall pick to make his MLB debut.