| Final wind 0.3m/s | time | electr | L | | 1. James Hines |  United States | 9.9s WR | 9.95s | 3 | | 2. Lennox Miller |  Jamaica | 10.0s | 10.04s | 4 | | 3. Charlie Greene | United States | 10.0s | 10.07s | 1 | | 4. Pablo Montes |  Cuba | 10.1s | 10.14s | 2 | | 5. Roger Bambuck |  France | 10.1s | 10.15s | 6 | | 6. Mel Pender | United States | 10.1s | 10.17s | 5 | | 7. Harry Jerome |  Canada | 10.1s | 10.20s | 7 | | 8. Jean-Louis Ravelomanantsoa |  Madagascar | 10.2s | 10.27s | 8 |
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| World Record | | 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 |
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| 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. |
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| | | First 4 from each of 2 Semis advanced to Final. |
| Semi 1 | time | electr | | 1. James Hines | United States | 10.0s | 10.08s | | 2. Roger Bambuck | France | 10.1s | 10.11s | | 3. Harry Jerome | Canada | 10.1s | 10.17s | | 4. Mel Pender | United States | 10.2s | 10.21s | | 5. Enrique Figuerola | Cuba | 10.2s | 10.23s | | 6. Hermes Ramírez | Cuba | 10.2s | 10.25s | | 7. Harald Eggers |  East Germany | 10.2s | 10.29s | | 8. Hideo Iijima |  Japan | 10.3s | 10.34s |
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| Semi 2 | time | electr | | 1. Charles Greene | United States | 10.1s | 10.13s | | 2. Lennox Miller | Jamaica | 10.1s | 10.15s | | 3. Pablo Montes | Cuba | 10.1s | 10.19s | | 4. Jean Ravelomanantsoa | Madagascar | 10.2s | 10.26s | | 5. Gaoussou Kone |  Ivory Coast | 10.2s | 10.27s | | 6. Ivan Moreno |  Chile | 10.3s | 10.37s | | 7. Gerard Fenouil | France | 10.3s | 10.40s | | 8. Hartmut Schelter | East Germany | 10.3s | 10.40s |
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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.
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| | | First 4 from each of 4 Quarters advanced to Semi-Finals. |
| Quarter 1 | time | electr | | 1. Lennox Miller | Jamaica | 10.1s | 10.11s | | 2. James Hines | United States | 10.1s | 10.14s | | 3. Enrique Figuerola | Cuba | 10.2s | 10.23s | | 4. Ivan Moreno | Chile | 10.3s | 10.37s | | 5. Andrés Calonce |  Argentina | 10.3s | 10.39s | | 6. Ronald Jones |  Great Britain | 10.4s | 10.42s | | 7. Karl-Peter Schmidtke |  West Germany | 10.4s | 10.48s | | 8. Vladislav Sapeia |  Soviet Union | 10.4s | 10.51s |
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| Quarter 2 | time | electr | | 1. Hermes Ramírez | Cuba | 10.0s | 10.10s | | 2. Mel Pender | United States | 10.1s | 10.16s | | 3. Roger Bambuck | France | 10.1s | 10.17s | | 4. Harry Jerome | Canada | 10.2s | 10.22s | | 5. Heinz Erbstößer | East Germany | 10.2s | 10.28s | | 6. Gerhard Wucherer | West Germany | 10.3s | 10.33s | | 7. Kolawole Abdulai |  Nigeria | 10.3s | 10.38s | | 8. Micheal Ahey |  Ghana | 10.4s | 10.49s |
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| Quarter 3 | time | electr | | 1. Pablo Montes | Cuba | 10.1s | 10.16s | | 2. Hartmut Schelter | East Germany | 10.2s | 10.29s | | 3. Hideo Lijima | Japan | 10.3s | 10.31s | | 4. Gerard Fenouil | France | 10.3s | 10.31s | | 5. Marian Dudziak |  Poland | 10.3s | 10.32s | | 6. Manikavasagam Jegathesan |  MAlaysia | 10.3s | 10.38s | | 7. Amos Omolo |  Uganda | 10.4s | 10.45s | | 8. Robert Ojo | Nigeria | 10.5s | 10.45s |
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| Quarter 4 | time | electr | | 1. Charles Greene | United States | 10.0s | 10.02s | | 2. Jean Ravelomanantsoa | Madagascar | 10.1s NR | 10.18s | | 3. Gaoussou Kone | Ivory Coast | 10.2s | 10.22s | | 4. Harald Eggers | East Germany | 10.2s | 10.25s | | 5. Barrie Kelly | Great Britain | 10.3s | 10.35s | | 6. Josselyn Delecour | France | 10.3s | 10.36s | | 7. Canagasabai Kunalan |  Singapore | 10.3s | 10.38s | | 8. Eddy Monsels |  Suriname | 10.4s | 10.45s |
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Heats - Sunday, 13th October | | First 3 from each of 9 Heats and next 5 Best times advanced to Quarter-Finals. |
| Heat 1 | time | electr | | 1. Greene Charles | United States | 10.0s | 10.09s | | 2. Lijima Hideo | Japan | 10.2s | 10.24s | | 3. Kunalan Canagasabai | Singapore | 10.4s | 10.47s | | 4. Wieslaw Maniak | Poland | 10.4s | 10.49s | | 5. Barka Sy |  Senegal | 10.6s | 10.61s | | 6. Alberto Torres |  Dominicana | 10.7s | | | 7. Santino Dralu | Uganda | 10.8s | |
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| Heat 2 | time | electr | | 1. James Hines | United States | 10.2s | 10.26s | | 2. Jean Ravelomanantsoa | Madagascar | 10.2s | 10.30s | | 3. Gaoussou Kone | Ivory Coast | 10.3s | 10.37s | | 4. Amos Omolo | Uganda | 10.4s | 10.50s | | 5. Porfirio Veras | Dominicana | 10.5s | 10.51s | | 6. Julius Sang |  Kenya | 10.6s | 10.64s | | 7. Jorge Vizcarondo |  Puerto Rico | 10.7s | 10.71s | | 8. Manuel Planchart |  Venezuela | 10.7s | 10.80s |
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| Heat 3 | time | electr | | 1. Enrique Figuerola | Cuba | 10.3s | 10.40s | | 2. Ivan Moreno | Chile | 10.5s | 10.53s | | 3. Barrie Kelly | Great Britain | 10.5s | 10.55s | | 4. Eugeny Siniaev | Soviet Union | 10.5s | 10.56s | | 5. Zenon Nowosz | Poland | 10.5s | 10.57s | | 6. Charles Asati | Kenya | 10.6s | 10.63s | | 7. Jimmy Sierra |  Colombia | 10.8s | 10.88s |
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| Heat 4 | time | electr | | 1. Pablo Montes | Cuba | 10.1s | 10.14s | | 2. Mel Pender | United States | 10.3s | 10.35s | | 3. Ronald Jones | Great Britain | 10.4s | 10.45s | | 4. Aleksey Khlopotnov | Soviet Union | 10.4s | 10.49s | | 5. Norris Stubbs |  Bahamas | 10.6s | 10.67s | | 6. Chuan-Show Chen |  Taiwan | 10.8s | 10.91s | | 7. Philippe Housiaux |  Belgium | 10.9s | 10.94s |
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| Heat 5 | time | electr | | 1. Roger Bambuck | France | 10.1s | 10.18s | | 2. Heinz Erbstößer | East Germany | 10.4s | 10.42s | | 3. Micheal Ahey | Ghana | 10.5s | 10.59s | | 4. Bernard Nottage | Bahamas | 10.6s | 10.64s | | 5. Ennio Preatoni |  Italy | 10.6s | 10.65s | | 6. Hansruedi Wiedmer |  Switzerland | 10.7s | 10.75s | | 7. Wen-ho Su |  Taiwan | 10.8s | 10.81s |
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| Heat 6 | time | electr | | 1. Lennox Miller | Jamaica | 10.1s | 10.15s | | 2. Hartmut Schelter | East Germany | 10.3s | 10.34s | | 3. Manikavasagam Jegathesan | Malaysia | 10.3s | 10.35s | | 4. Robert Ojo | Nigeria | 10.4s | 10.47s | | 5. Ronald Monsegue |  Trinidad Tobago | 10.5s | 10.56s | | 6. Rogelio Onofre |  Philippines | 10.5s | 10.58s | | -. Tom Robinson | Bahamas | DNF | |
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| Heat 7 | time | electr | | 1. Harry Jerome | Canada | 10.3s | 10.35s | | 2. Karl-Peter Schmidtke | West Germany | 10.3s | 10.38s | | 3. Harald Eggers | East Germany | 10.3s | 10.38s | | 4. Kolawole Abdulai | Nigeria | 10.4s | 10.45s | | 5. Miguel González |  Mexico | 10.5s | 10.59s | | 6. Pablo McNeil | Jamaica | 10.6s | 10.62s | | 7. Hassan Emech |  Marocco | 10.7s | 10.79s | | 8. Gasmalla Morgan |  Sudan | 11.0s | 11.09s |
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| Heat 8 | time | electr | | 1. Gerard Fenouil | France | 10.4s | 10.42s | | 2. Gerhard Wucherer | West Germany | 10.4s | 10.42s | | 3. Marian Dudziak | Poland | 10.4s | 10.46s | | 4. Vladislav Sapeia | Soviet Union | 10.4s | 10.46s | | 5. Eddy Monsels | Suriname | 10.4s | 10.48s | | 6. Gregory Lewis |  Australia | 10.5s | 10.55s | | 7. Felix Becquer | Mexico | 10.7s | 10.72s | | 8. Rafael Santos |  El Salvador | 11.2s | 11.22s |
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| Heat 9 | time | electr | | 1. Hermes Ramírez | Cuba | 10.2s | 10.30s | | 2. Andrés Calonce | Argentina | 10.4s | 10.44s | | 3. Jocelyn Delecour | France | 10.4s | 10.45s | | 4. Gert Metz | West Germany | 10.5s | 10.55s | | 5. Norman Chihota |  Tanzania | 10.5s | 10.57s | | 6. Horacio Estevez | Venezuela | 10.6s | 10.65s | | 7. Jose Sanchez |  Spain | 10.6s | 10.69s | | 8. Juan Argüello |  Nicaragua | 11.1s | 11.18s |
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