Denny McLain:
McLain is a unique case from a throwback era. He was once one of the most effective pitchers in all of baseball. He was so good, in fact, that he won 31 games during the 1968 season, leading his Detroit Tigers to the World Series title. McLain was not surprisingly their MVP. The wins are a number that may not be reached ever again by an MLB starting pitcher.
However, his career soon went off the rails in more ways than one. McLain became embroiled in a host of legal troubles MLB suspended him for being in league with nefarious gamblers, and he was later convicted of racketeering and conspiracy to distribute cocaine. When he came back from his suspension he was nowhere near the player he once was. He went 10-22 as a starter in 1970 as proof. Another waste of talent despite his Cy Young-winning 1968 season. He had the talent to be great, but let off-the-field troubles sap that from him.