Enny Romero came up as a well-regarded prospect in the Tampa Bay Rays system after signing with the team as an international free agent in 2009. Most impressive was his fastball velocity as a left-hander, and his secondary stuff showed promise as well, even though it was raw.
Romero saw mixed results in the lower minors, but the Rays recognized his potential and added him to the 40-man roster in 2012 following his age-21 season at High-A Charlotte. He responded with a solid 2013 effort at Double-A, posting a 2.76 ERA over 140.1 frames and even getting a late-season start at Triple-A before making his big-league debut in September and tossing 4 and 2/3 scoreless innings in his lone outing.