The Rockies have designated left-handed pitcher Ken Roberts for assignment in order to clear space on the 40-man roster for fellow lefty Jason Gurka, tweets Patrick Saunders of the Denver Post.
Roberts, 27, made his Major League debut for the Rox in 2015, appearing in nine games and totaling 9 1/3 innings with a 5.79 ERA and a five-to-two K/BB ratio. A longtime farmhand of the Rockies, Roberts was selected in the 25th round of the 2010 draft and posted strong minor league numbers until reaching Triple-A for the first time this season.