Failed attempts:
Justin Gatlin's timing of 9.77 seconds, achieved at Doha in May 2006, was annulled in 2007 after he failed a doping test in April 2006.
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Ben Johnson (in picture) clocked 9.79 seconds at the 1988 Seoul Olympics, but his record was scratched as he tested positive for stanozolol after the race.
Tim Montgomery's time of 9.78 seconds at Paris on September 2002 was invalidated following his indictment in the BALCO scandal. The time had stood as the world record until Asafa Powell first timed 9.77 seconds.
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