The 100-meter final featured four of the fastest men to ever set foot on a track, but in the back of everyone's mind, the result was never in doubt.
Usain Bolt ran the fastest time in Olympic history with a 9.64 in the finals, breaking his own record from 2008 in Beijing.
Bolt became only the second man to win gold in the 100-meter dash in consecutive Olympic Games, cementing his dominance of the era and giving him a place at the top of track and field history with Carl Lewis.
It's hard to compare the times of the two and say who is the better sprinter. Different technologies and training methods have improved times over the years, as seen in this video from The New York Times comparing each medalist in the 100 since 1896.
A good way to measure greatness is dominance.
Bolt has been hands down the best sprinter over the past half-decade, running so far out in front, he could celebrate before even crossing the finish line in world-record time.
He continuously is smashing his own world records and setting precedents in the sport that for years to come will be viewed with awe.
The thing that links Lewis and Bolt will also be what separates them.
Lewis won the 100 in both 1984 and 1988, but he was unable to secure gold in the 200-meter dash the second time around, losing to Joe DeLoach by .04 seconds.
If Bolt can do what Lewis couldn't, it will erase any doubt as to who is the greatest ever. The consistent ability to dominate the field while continuing to improve is what makes Bolt great. To be able to do that in two events over a four-year period is truly special.
Usain Bolt 200-meter dash schedule:
Preliminary Heats: Tuesday, 6:50 a.m. ET
Semifinal Heats: Wednesday, 3:10 p.m. ET
Final Heat: Thursday, 3:55 p.m. ET
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