Just before kicking off the post-All Star portion of the season, the Cubs traded their starting left fielder for an advanced A-ball first base prospect. Pederson had not proven himself integral to what middling success the Cubs had managed so far this season, and the team could conceivably improve without him. However, the Cubs were rumored to be sellers going into the All-Star break and this move lends further support. They'll continue on, for now, with remaining core players like Javy, Rizzo, Bryant, and Contreras--but we'll be watching these games knowing any of those players could be making their last appearances in Cubs blue.
The current Cubs will be taking up bat and glove against D-Backs club with the worst record in the majors. Arizona enters the series second to last in the majors wRC+ and dead last in pitching WAR with a shocking 1.0 in fWAR--a team 5.48 ERA in the DH-less league will do that. Still, things won't necessarily be easygoing for the Cubs. See below for my best guess at pitching matchups. [Edit: my guesses were wrong.]