Rockies pitching prospects Sam Howard and Ryan Castellani, along with infielder Ryan McMahon, head the least of 22 non-roster invitees receiving invitations to major league spring training. The list was announced Thursday.
The left-handed Howard, 23, and the right-handed Castellani, 20, are considered two of the Rockies most promising young pitchers. Howard was drafted out of Georgia Southern in the third round of the 2014 draft, while Castellani was selected in the second round of the 2014 draft out of Brophy Jesuit High School in Arizona.
Though McMahon struggled last season with Double-A Hartford — hitting .