The Cubs got a mixed bag of medical news Monday, but one thing is true: They're keeping MRI techs busy.

Third baseman Ian Stewart had an MRI of his injured left quad, and manager Dale Sveum conceded the window is "getting ready to shut, being ready for Opening Day."

Pitcher Scott Baker underwent an MRI on his right elbow one day after making his Cactus League debut. Baker had Tommy John surgery on the elbow last April 17.

"He felt good and then he came in today kind of sore," Sveum said.

Baker was not scheduled to start the season on the active roster anyway.

On a more positive note for the Cubs, ace Matt Garza reported good results after throwing from 75 feet Sunday. Garza, whose 2012 season ended in July with a "stress reaction" in his right elbow, was on the mend from a left-lat-muscle injury he suffered early in spring training.

The Cubs have been talking about a May 1 return for Garza, but Sveum said it could come "seven days after May 1, seven days before."

Garza said he is feeling fine even though there is no set date for him to throw off a mound.

"We went to 75 (feet) yesterday for the second day," he said. "Twenty throws. No pain. Good action. I'm pushing to try to speed it up, but they have me on a real set pace right now. It's going real good."

Garza is throwing every other day, and he said he wants to build up the distance he throws before getting up on the mound.