Number 6: Mark Mangum
In 2012, Bleacher Report actually ranked Mark Mangum as the worst draft pick in Rockies history but a lot has changed in eight years. Also, I have him a bit lower on the list since he didn’t cost the Rockies as much as most of the others have.
Mark Mangum was drafted as the 17th overall pick in the 1997 draft. He made 14 starts for the Rockies in Rookie-ball, where he went 4-6 with a 4.80 ERA.
After that one season, the Rockies traded him along with Terry Jones to the Montreal Expos for reliever Dave Veres and Mark Hamlin. Veres had a great 1998 season (2.83 ERA, 183 ERA+) but he struggled more in 1999 as closer (5.14 ERA).
For the Expos, Mangum never got above Double-A and he was out of baseball after the 2002 season, or before his 24th birthday.