Silmon, a first-team All-American who set the MW record (10.04) during competition at last month's NCAA West Region Prelims in Austin, Texas, posted a time of 10.17 on Saturday. The top performance of the day was turned in by Justin Gatlin, the 2004 Olympic gold medalist who finished in a time of 9.90.
Meanwhile, former TCU standout and current UNLV assistant coach Khadevis Robinson posted the fastest time of the day in the semifinals of the men's 800 meters with a mark of 1:45.83. Robinson was the only runner to post a sub-1:46.0 in the event's two heats.
Robinson will make his second Olympic appearance with a top-three finish in Monday's final. He also represented the U.S. in the 2004 Games in Athens.
In women's action, former UNLV sprinter Lekeisha Lawson came up short in her attempt to qualify in the women's 100 meters, finishing 18th in a time of 11.54.