"It looks like his elbow," Rockies manager Walt Weiss said. "It's been bothering him off and on, but he was good to go today. He was good to go more than one [inning] today. But that was bothering a week and a half or so ago. It started bothering him a little bit."
Escalona's ERA climbed to 4.18 after he surrendered three runs in just one-third of an inning.
Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. Ian McCue is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.