This was the eighth time the event was held, having appeared at every Olympics since the first in 1896. None of the 1924 finalists competed. Notable entrants included Frank Wykoff, winner of the U.S. Olympic trials and by default one of the favorites in a field that was "considered to be wide-open"; Great Britain's Jack London, and Germany's Georg Lammers. Cuba, Lithuania, and Romania were represented in the event for the first time. The United States was the only nation to have appeared at each of the first eight Olympic men's 100 metres events.
Competition format
The event retained the four round format from 1920 and 1924: heats, quarterfinals, semifinals, and a final. There were 16 heats, of 3–6 athletes each, with the top 2 in each heat advancing to the quarterfinals. The 32 quarterfinalists were placed into 6 heats of 5 or 6 athletes. Again, the top 2 advanced. There were 2 heats of 6 semifinalists, this time with the top 3 advancing to the 6-man final.
Percy Williams equalized the standing Olympic record with 10.6 seconds in the fourth heat of the second round. In the first semifinal, Williams, Robert McAllister, and Wilfred Legg all equalized the record.
Results
First Round
Sixteen heats were held, the two fastest of each qualified for the second round.
Heat 1
Rank
Athlete
Nation
Time
Notes
1
11.0
2
11.0
3
11.2
4
11.4
5
11.4
Heat 2
Rank
Athlete
Nation
Time
Notes
1
11.2
2
11.3
3
Unknown
4
Unknown
—
Heat 3
Rank
Athlete
Nation
Time
Notes
1
11.0
2
Unknown
3
Unknown'
4
Unknown
5
Unknown
6
Unknown
' Some sources credit the third place to Gómez Daza and list Boot in fourth.
Heat 4
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
11.4
4
11.4
5
Unknown
6
Unknown
Heat 5
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
Unknown
4
Unknown
5
Unknown
Heat 6
Rank
Athlete
Nation
Time
Notes
1
11.0
2
Unknown
3
Unknown
4
Unknown
5
Unknown
Heat 7
Rank
Athlete
Nation
Time
Notes
1
11.0
2
11.0
3
Unknown
—
—
Heat 8
Rank
Athlete
Nation
Time
Notes
1
11.0
2
11.0
3
11.3
4
11.4
Heat 9
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
Unknown
4
Unknown
5
Unknown
6
Unknown
Heat 10
Rank
Athlete
Nation
Time
Notes
1
11.0
2
11.1
3
Unknown
4
Unknown
Heat 11
Rank
Athlete
Nation
Time
Notes
1
11.0
2
11.1
3
Unknown
4
Unknown
5
Unknown
6
Unknown
Heat 12
Rank
Athlete
Nation
Time
Notes
1
11.0
2
Unknown
3
Unknown
4
Unknown
5
Unknown
Heat 13
Rank
Athlete
Nation
Time
Notes
1
11.0
2
Unknown
3
Unknown
-
Heat 14
Rank
Athlete
Nation
Time
Notes
1
11.0
2
11.1
3
11.2
4
11.3
5
11.5
6
12.2
Heat 15
Rank
Athlete
Nation
Time
Notes
1
11.0
2
Unknown
3
Unknown
4
Unknown
Heat 16
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
Unknown
4
Unknown
5
Quarterfinals
Six heats were held, the two fastest of each qualified for the semifinals.
Quarterfinal 1
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
Unknown
4
Unknown
5
Unknown
6
Unknown
Quarterfinal 2
Rank
Athlete
Nation
Time
Notes
1
10.8
2
11.0
3
Unknown
4
Unknown
5
Unknown
6
Unknown
Quarterfinal 3
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
Unknown
4
Unknown
5
Unknown
Quarterfinal 4
Rank
Athlete
Nation
Time
Notes
1
10.6
, =OR
2
10.8
3
Unknown
4
Unknown
5
Unknown
Quarterfinal 5
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
Unknown
4
Unknown
5
11.0
Quarterfinal 6
Rank
Athlete
Nation
Time
Notes
1
10.8
2
Unknown
3
Unknown
4
Unknown
5
Unknown
Semifinals
Two semifinals were held, the three fastest of each qualified for the final.
Semifinal 1
Rank
Athlete
Nation
Time
Notes
1
10.6
, =OR
2
10.6
, =OR
3
10.6
. =OR
4
10.7
5
10.8
6
11.0
Semifinal 2
Rank
Athlete
Nation
Time
Notes
1
10.6
, =OR
2
10.7
3
10.7
4
10.8
5
10.8
6
10.9
Final
There were two false starts, by Legg and Wykoff. Once the final successfully started, Williams took the early lead and never relinquished it.