9.58. It took 30 years to get from 10.00 seconds to sub-9.90 seconds. It took 1 year to go from 9.70 to sub-9.60. It's the biggest drop in the 100m WR since electronic timing was introduced. Simply, without question, the greatest sprinter in human history. And P.S. Tyson Gay ran an amazing American Record 9.71.