Contreras walked out of the batter's box and pointed two fingers at Brewers right-hander Brad Boxberger before directing his anger toward Milwaukee's dugout, though the division rivals didn't throw any punches.
"I think he just took exception to getting hit in the head yesterday, and then up around the shoulder, elbow area," Cubs manager David Ross said, according to MLB.com's Jordan Bastian and Adam McCalvy. "It's just scary right now. At some point, you have to be better. You can't just continue to try to pitch in and hit guys. You've got to be better."
"It's obviously not intentional," said Brewers infielder Travis Shaw. "At the same time, he did get hit in the head last night, so I kind of understand some frustration. We're not trying to hit him. It's 4-0. But when you get hit in the head the night before and then you get hit again, I can understand the tempers and the frustration."
The Brewers won 4-0.