Extra bases

Extra bases

• Pitcher Randy Wells underwent arthroscopic surgery on his right elbow on Tuesday in Chicago and is likely done for the season. Wells, 29, had been pitching at Triple-A Iowa, and lasted just 1 2/3 innings in his last start July 14 against Omaha. He was placed on the disabled list shortly after that with soreness in his right elbow. In nine games with Iowa, Wells was 3-3 with a 7.89 ERA.

A 12-game winner in 2009 with the Cubs, Wells had a good spring but didn't make the Opening Day rotation. He was called up April 21, and made two starts for Matt Garza, who was ill, then was sent back to Iowa on May 3. He rejoined the Cubs on May 19 and pitched out of the bullpen, except for two starts June 20 and June 26. Wells was designated for assignment on June 27 to clear a spot on the 40-man roster for Jorge Soler.