Rosa was selected as Cleburne’s team MVP following a 2018 season in which he emerged as one of the most potent bats among American Association infielders. The 26-year old started the year slowly with the Kansas City T-Bones, hitting .229 over 28 games with two home runs. The Railroaders acquired Rosa on June 26 in exchange for a player to be named later, and the move paid immediate dividends. Over the course of 52 games in Cleburne, Rosa pounded 12 doubles, two triples, and 14 home runs, notching 28 extra-base hits in only 211 at-bats. The native of Puerto Rico raised his batting average more than 20 points to .251, and added eight stolen bases in 11 attempts.  

Prior to the 2018 campaign, Rosa’s professional experience came almost exclusively in the Los Angeles Angels organization, where he spent five seasons. He debuted as a 20-year old at Rookie-level Orem in 2013, then steadily climbed the ladder until reaching Triple-A Salt Lake for the first time in 2015. Rosa played 47 more games with Salt Lake in 2016, then began the 2017 season at Double-A Mobile before being released by the Angels organization. He finished out the year with the Bridgeport Bluefish of the Atlantic League before latching on with Kansas City to begin 2018.