All games on WSCR-AM 670. Season series: Cubs 3-2. Friday: 7:10 p.m., CSN+. RH Jason Hammel (8-5, 3.34) vs. RH Jimmy Nelson (6-7, 3.39). Saturday: 6:10 p.m., WGN-9. RH John Lackey (7-6, 3.75) vs. RH Zach Davies (6-4, 3.79). Sunday: 1:10 p.m., ABC-7. LH Jon Lester (10-4, 2.89) vs. RH Junior Guerra...