Series preview: Cubs at Diamondbacks
All games on WSCR-AM 670.
Season series: Diamondbacks 2-1.
Friday: 8:40 p.m., CSN.
RH John Lackey (9-9, 4.81) vs. RH Taijuan Walker (6-5, 3.60).
Saturday: 7:10 p.m., WGN-9.
LH Jon Lester (8-6, 3.97) vs. LH Patrick Corbin (8-11, 4.76).
Sunday: 3:10 p.m., ABC-7.
RH Jake Arrieta (11-8, 3.83) vs. RH...