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Nathan Adrian previously held the American record in the 50-meter freestyle, a sprint event in competitive swimming. This record was set at the 2009 World Championships in Rome, Italy, where Adrian clocked a time of 21.50 seconds. He held the record for several years until it was broken by Caeleb Dressel in 2017. Adrian's record-breaking performance showcased his exceptional speed and technique in the 50-meter freestyle.