Cubs pitcher Angel Guzman throwing off the mound during his rehab stint Friday in Mesa, Ariz.

BRUCE MILES | Staff Photographer

Cubs pitcher Carlos Zambrano gets loose for his bullpen session Friday in Mesa, Ariz.

BRUCE MILES | Staff Photographer

Two baseball players from Canada, catcher Chris Robinson from Ontario and pitcher Ryan Dempster from British Columbia, go over a few things on Friday at Cubs camp in Mesa, Ariz.

BRUCE MILES | Staff Photographer

Cubs outfielder Fernando Perez takes batting practice Friday in Mesa, Ariz.

BRUCE MILES | Staff Photographer

Chicago Cubs pitcher Jeff Samardzija throws on Friday.

ASSOCIATED PRESS

Chicago Cubs infielder Darwin Barney makes a catch on Friday.

ASSOCIATED PRESS

Chicago Cubs infielder Carlos Pena takes batting practice on Friday.

ASSOCIATED PRESS

Chicago Cubs pitcher Braden Looper stretches on Friday.

ASSOCIATED PRESS

Chicago Cubs pitcher Carlos Zambrano throws on Friday.

ASSOCIATED PRESS

Chicago Cubs outfielder Marion Byrd takes batting practice on Friday.

ASSOCIATED PRESS

Chicago Cubs players prepare for batting practice on Friday.

ASSOCIATED PRESS

Chicago Cubs catcher Geovany Soto tries to catch a pitch out of the dirt on Friday.

ASSOCIATED PRESS