"It feels better than it did, but I don't feel great," said Oswalt, who received treatment, performed light exercise on the stationary bike and fitness machines Tuesday, and did some throwing in an effort to keep his arm in shape for when he is cleared to begin pitching. "The good thing is we do have the All-Star break, so that's four days I won't miss.
"I'm hoping to miss two starts at the most and be ready to go."
Oswalt signed with the Rockies in May with the hope of bringing experience and quality to the rotation. Oswalt returned with a lively fastball, but wasn't sharp with his off-speed stuff or consistent with his location. He said his pitch mix seemed on the mark Sunday, before he was injured. He is 0-4 with a 7.64 ERA in four starts.
AJ Cassavell is a reporter for MLB.com. Follow him on Twitter @ajcassavell. Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.