In 1996, Johnson ran 19.66 seconds in the 200 m at the U.S. Olympic Trials, breaking Pietro Mennea's record of 19.72 seconds, which had stood for 17 years.
At the 200 m final on August 1, Johnson ran the opening 100 meters in 10.12 seconds and finished the race in a world record time of 19.32 seconds, breaking by more than three tenths of a second the previous record he had set in the U.S. Olympic Trials, on the same track one month earlier—the largest improvement ever on a 200 m world record.

Michael Johnson 200 m world record 19.32
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