Joe Mather leads off and plays right field as the Cubs begin a weekend series against the Rockies and left-hander Drew Pomeranz.

Josh Vitters bats second and Jeff Samardzija pitches for the Cubs.

The lineup:

Mather, rf

Vitters, 3b

Rizzo, 1b

Soriano, lf

Castro, ss

Castillo, c

Jackson, cf

Barney, 2b

Samardzija, p

dvandyck@tribune.com