Career stats: 194-112 W-L record, 3.51 ERA, 2,293 Ks
Years active: 1984-2000
Substance(s) involved: Cocaine
In 1984, just 19 years of age at the time, Dwight "Doc" Gooden became the youngest pitcher to ever take the mound at an All-Star Game. In that same season—his rookie year—Gooden also won the NL Rookie of the Year Award, and put up more wins, a lower ERA, and struck out more batters than NL Cy Young winner Rick Sutcliffe. The next season, Gooden would absolutely dominate the NL, winning 24 games, fanning 268 batters, and posting a 1.53 ERA. Simply put, early on in his career, Gooden was a monster.
Unfortunately, drugs proved to be an even bigger one for Gooden. Doc tested positive for cocaine use at the beginning of the 1987 season, and would later fail another test in 1994, earning himself a 60-day suspension. As the years went by, Gooden's career declined further and further and, in the end, the once-surefire Hall of Famer would finish out his career as a mop-up reliever for the Yankees, just a shell of his former self.