The Rockies have selected the contract of lefty Kenny Roberts and designated righty Jorge Rondon for assignment, Patrick Saunders of the Denver Post tweets. The Rockies claimed Rondon from the Cardinals last November, and he got good results in a handful of outings at Triple-A, but to say his two outings with Colorado went poorly would be an understatement. He had a disastrous night Friday in San Diego, allowing eight runs, seven of them earned, without recording an out. He also allowed three runs in an inning in his other outing, which came against the Diamondbacks last week.
The 27-year-old Rondon has struggled to establish himself in the big leagues despite tempting velocity — his fastball has averaged over 95 MPH in his brief stints with both the Rockies and with the Cardinals last season. He spent much of 2014 with Triple-A Memphis, posting a 3.03 ERA, 7.4 K/9 and 2.9 BB/9 in 62 1/3 innings.
Roberts, 27, had posted a 3.27 ERA so far this season had Triple-A Albuquerque, striking out eight and walking none. The lefty has a career 2.37 ERA in a slow climb through the Rockies’ minor-league system.