The Minnesota Twins originally signed Eduardo Antonio (Hernandez) Del Rosario (born 5/19/95) in December of 2012 out of the Dominican Republic where was already 17 and a very lean pitcher.
Del Rosario made his pro debut with the Dominican Summer League in 2013, throwing 44 1/3 innings, with a 2.03 ERA, 1.06 WHIP, a 14.2% walk rate, and a 17% strikeout rate.
Del Rosario was used out of the bullpen in the Gulf Coast League in 2014, throwing 28 1/3 innings with a 3.49 ERA, 1.27 WHIP, 7.3% walk rate, and 20.2% strikeout rate. He returned to the GCL to open 2015 as he was moved to the rotation, and with one late year start in Elizabethton, he put up an excellent line, throwing 51 1/3 innings with a 2.