The Cubs finished Saturday's loss at the Nationals under protest after Joe Maddon saw what he believed to be an inconsistency in how illegal pitches are being called.
Nationals reliever Sean Doolittle came in to close the game out in the ninth with the Nats up 5-2. After one pitch, Maddon went to the umpires to complain. This dragged on throughout the inning.
Maddon didn't like that Doolittle's delivery involved him pausing and potentially even touching the ground in the middle of his wind up before coming home with the pitch. To Maddon, it was clearly an illegal pitch and he was fired up because that's something Carl Edwards Jr.