In a surprise, the field did not include Trayvon Bromell of the United States, who had the fastest lifetime best among the semifinalists: 9.77 seconds, which he had run in June.
But after struggling to a fourth-place finish in his opening-round heat on Saturday, he finished third in the second of three semifinals on Sunday, missing out on an automatic spot in the final by a thousandth of a second. The top four runners in the third semifinal were all faster than Bromell, knocking him out of the final.