Tommy Edman is the next middling Cardinals prospect to come out of nowhere and play a key role on a Cardinals team contending for a playoff spot. In 2016, Aledmys Diaz posted a 132 wRC+ en route to being named to the NL all-star team. While he did not provide much in the way of defense, the production that he provided at the plate was completely unexpected at the beginning of the season.
Diaz signed a 4-year, $8 million with the Cardinals back in 2014 as an international free agent.