When the St. Louis Cardinals moved left-handed pitching prospect Rob Kaminsky for Brandon Moss in 2015, the team believed they were trading for an All-Star. In 2014, Moss posted a slash line of .234/.334/.438 while hitting 25 home runs. His hydro-thermal first half—in which he hit 21 HRs while posting a .878 OPS—got him selected to the only All-Star game of his career.
Unfortunately though, that wasn’t the player that showed up to St. Louis in 2015. In 51 games with the Cards, Moss slugged just .409 and managed only 4 home runs while striking out 42 times.