Lester takes mound vs. Rockies in opener
(MLB.com Chicago Cubs)

The Rockies and Cubs open a four-game series on Thursday, as right-hander Tyler Chatwood and left-hander Jon Lester match up at Wrigley Field. Chatwood was originally scheduled to start in the second game of the series on Friday, but Colorado swapped his turn in the rotation with German Marquez. Marquez is getting an extra day of rest for his bruised thumb after it was hit with a comebacker in his last start in San Diego.