"Our staff in general has been pitching really well, but him especially," Cubs catcher Alex Avila said. "With the movement and the deception he has in his delivery , when he's locating, he's one of the toughest pitchers to square up as a hitter."
In Arrieta's last start against the Pirates, he posted his eighth quality start in nine outings since the All-Star break.
Arrieta opened the month against the D-backs on Aug. 2 and struck out eight over seven innings, giving up one earned run on three hits. He held opponents to a .201 batting average against.
This is the fourth time Arrieta, the 2015 NL Cy Young Award winner, has won a Pitcher of the Month Award. He also did so in back-to-back months in 2015 (August and September) and in April 2016.
Carrie Muskat has covered the Cubs since 1987, and for MLB.com since 2001. She writes a blog, Muskat Ramblings. You can follow her on Twitter @CarrieMuskat and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.