Cubs 8, Pirates 2
CHICAGO — Unbeaten Jake Arrieta struck out 11 in eight innings, Anthony Rizzo drove in four runs and the Cubs improved to 5-0 against the Pirates. Arrieta improved to 18-0 in 20 outings since Aug. 1. The Cubs have won his past 21 starts, extending a franchise record. The reigning NL Cy Young Award winner gave up three hits and two runs, leaving with a 1.29 ERA.