The Rockies are hurting down on the farm.
Manager Bud Black confirmed Friday that two of the club’s top prospects — left-handed starter Ryan Rolison and corner infielder Colton Welker — will undergo shoulder surgery and are lost for the season.
“It’s unfortunate because both guys were so close to trying to solidify themselves as major-leaguers,” Black said before the Rockies hosted Atlanta. “Welker . . .
