|Born: May 1, 1997|
Bergner initially attended West Orange High School in Winter Garden, Florida, where he started receiving national attention as a sophomore. He represented the United States U18 team that won a gold medal at the 2014 COPABE Pan American Championships in Mexico. In a game against Cuba, he was brought in to close out the game in the ninth inning, earning the save in a 5–4 win. He subsequently represented Team USA at the 2015 WBSC U-18 Baseball World Cup in Japan, where they also won gold. In their opening game against the Czech Republic, he struck out nine batters in six innings to lead USA to an 11–1 mercy rule win. He transferred to Windermere Prep in 2015, the summer before his junior year. That season, he had a 6–1 win-loss record and 0.40 earned run average (ERA) in 52.2 innings pitched. Sports Illustrated named him the #3 high school pitcher in the nation from the class of 2016, and USA Today selected him as the #14 most promising prospect in his class. After his senior year, he was drafted by the Boston Red Sox in the 38th round of the 2016 MLB draft, but he did not sign, and instead chose to attend the University of North Carolina to play college baseball. In 2018, he played collegiate summer baseball with the Chatham Anglers of the Cape Cod Baseball League.
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- "Bergner draft by Detroit Tigers in 9th round of MLB draft". goheels.com. North Carolina Tar Heels. July 4, 2019. Retrieved July 19, 2019.