White Sox pitching coach Ethan Katz, left, and starting pitcher Lucas Giolito Cardinals starting pitcher Jack Flaherty during the first inning May 25, 2021, at Guaranteed Rate Field. Giolito and Flaherty attended Harvard-Westlake School in Los Angeles; Giolito was a senior in 2012 when Flaherty was a sophomore. Their pitching coach was Ethan Katz, who is in his first season in the same role with the Sox. (Armando L. Sanchez / Chicago Tribune)
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