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Max Schmeling won his first heavyweight championship on June 12, 1930, by disqualification. The fight, held at Yankee Stadium in New York, was against the reigning champion, Jack Sharkey. In the fourth round, Sharkey struck Schmeling with a low blow, causing the referee to disqualify him. This victory marked a significant moment in boxing history, as Schmeling became the first German to win the world heavyweight title.