MLB.com's Adam Berry offered a brief take on the scene with Maddon at PNC Park:
Rizzo hit a ball that was originally ruled a home run. The umpires reversed the call to foul without going to replay, then proceeded to check the replay and uphold the foul ruling. Maddon proceeded to argue the decision and was thrown out of the game by third base umpire Jeff Kellogg.
Maddon's ejection is the latest setback in what has been a disappointing season for the defending World Series champions.
The Cubs entered Friday with a 32-33 record, 2.5 games behind the Milwaukee Brewers in the National League Central. They didn't lose their 33rd game last year until July 7.
Offense has been difficult to come by for the Cubs, who rank 16th in runs scored and 29th in batting average. Maddon has continued to search for answers, including moving Rizzo into the leadoff spot on Tuesday.