A four-game series between the Baltimore Orioles and Chicago White Sox opened Friday night with a relatively harmless bench clearing in the second inning after pitcher Michael Kopech hit Orioles shortstop Jorge Mateo with a 99 mph fastball to the back. 

Kopech had a 1-2 count when he nailed Mateo near the left shoulder with a similar pitch to one that plunked Chicago’s Josh Harrison Thursday.

Jorge Mateo hit at bat

Jorge Mateo of the Baltimore Orioles is hit by a pitch, which led to benches clearing in the second inning at Guaranteed Rate Field June 24, 2022, in Chicago.  (Quinn Harris/Getty Images)

The Orioles cleared their bench first with the White Sox following, but tensions didn’t erupt into anything physical. 

"I don’t know what happened there, what were they thinking. But I really don’t think it was intentional," Mateo said through a translator.

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Orioles and White Sox hit by pitch

The Chicago White Sox and Baltimore Orioles cleared their benches in the second inning after Jorge Mateo (3) of the Orioles was hit by a pitch from Michael Kopech (34) of the White Sox at Guaranteed Rate Field June 24, 2022, in Chicago.  (Quinn Harris/Getty Images)

"In the heat of the moment, it’s normal," he said of the disruption. "People start talking, saying stuff. You feel something. You feel uncomfortable. But it’s normal in the heat of the moment."

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Kopech said the errant pitch wasn’t intentional and that things escalated because "some guys hopped the rail and started talking." 

Orioles and White Sox clear benches

Players from the Baltimore Orioles and Chicago White Sox exchange words after Jorge Mateo of the Baltimore Orioles was hit by a pitch from Chicago White Sox starter Michael Kopech during the second inning in Chicago Friday, June 24, 2022.  (AP Photo/Nam Y. Huh)

"They took offense to it, I guess, but I'm trying to rear back and do a little bit more," he said, via MLB.com. "Fly open, the ball got away from me. Definitely not trying to hit a guy with two strikes and two outs. Especially a guy who's not doing too much at the plate. Situation kind of escalated, but then it settled back in."

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Both teams were issued warnings, and the Orioles won 4-0. The White Sox dropped their third in a row, and Kopech lost his second straight start.

The Associated Press contributed to this report.