9.9 Jim Hines, United States Sacramento, United States 20 June 1968
9.9 Ronnie Ray Smith, United States Sacramento, United States 20 June 1968
9.9 Charles Greene, United States Sacramento, United States 20 June 1968
Olympic Record
10.0 Robert Hayes, United States Tokyo, Japan 15 October 1964
Jim Hines had a time of 9.9 seconds (hand-timed) or 9.95 seconds (auto-timed) in the final. This equalled the world record and set a new Olympic record, which were measured by hand-timing at that point. The 9.95 second time was recognized as the initial world record for electronic timed results when the IAAF changed its records rules in 1977.
The effects of altitude and improved synthetic track surfaces meant that
24 marks of under 10.20 were recorded in Mexico City (in 1964 there
were three such times). Hines and Greene had been the first to record
legal 9.9 clockings earlier in the year, and Greene ran the fastest ever
preliminary race (10.02) in the second round. Hines won the first semi-
final (10.08) from Bambuck (10.11) and Jerome (10.17), while Greene
suffered a hamstring strain in taking the other semi-final in 10.13 from
Miller (10.15) and the surprising Montes (10.19).
In the final the tiny power-packed Pender (1.65/72kg) exploded out
to an early lead, but was caught by Hines at halfway. Hines was a metre
clear by 70m, at which point Greene aggravated his injury when
attempting his usual late race surge. Miller slipped by Greene with 10m
to go, and Hines finished with the first ever legal sub-10 mark on elec-
tric timing.
On television pictures, the photo-cell time shown at the finish was
9.89. That is because the timer mechanism was adjusted with a delay
of 0.05 according to IAAF policy in 1964-1970. So the actual cell time
would have been 9.94, which was adjusted to 9.95 when the photo-
graph was examined.